2022-01-19T20:49:50Z
https://www.sciencepubco.com/index.php/IJAA/oai
oai:ojs.pkp.sfu.ca:article/17346
2019-05-11T07:04:02Z
IJAA:ART
"190511 2019 eng "
2312-7414
dc
On merging of resonant periodic orbits 4:3; 3:2 and 2:1 in Sun-Jupiter photo gravitational restricted three-body problem
Kumar, Prashant
Department of Aerospace EngineeringKarunya UniversityCoimbatore-641114Tamilnadu, India
Krishan Sharma, Ram
Department of Aerospace Engineering, Karunya Institute of Technology and Sciences, Coimbatore - 641114, Tamil Nadu
Restricted Three Body Problem; First-Order; Interior Resonance; Poincaré Surface of Section; Solar Radiation Pressure.
We explore the merging of resonant periodic orbits in the frame work of planar circular restricted three body problem with the help of Poincaré surface of section. We have studied the effect of solar radiation pressure on 4:3, 3:2 and 2:1 periodic orbits. It is found that radiation pressure helps in merging these orbits (4:3 and 3.2 into 1:1 resonance and 2:1 into 1:1 resonance). At the time of merging these orbits become near-circular. The period and size of these orbits reduce with the increase in radiation pressure.
Science Publishing Corporation
2019-05-04 08:29:05
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/17346
International Journal of Advanced Astronomy; Vol 7, No 1 (2019)
eng
Copyright (c) 2019 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/6140
2016-05-28T11:55:30Z
IJAA:ART
"160527 2016 eng "
2312-7414
dc
Restricted three-body problem with stokes drag effect when less massive primary is an ellipsoid
Idrisi, M Javed
School of Physical and Molecular SciencesDepartment of MathematicsAl-Falah UniversityFaridabad (Haryana) - 121004
Jain, Mamta
Department of Mathematics, Shri Venkateshwara University, U.P. – 244236
Restricted Three Body Problem; Libration Points; Linear Stability; Stokes Drag.
The present paper deals with the effect of Stokes drag force on the existence and stability of collinear and non-collinear libration points in circular restricted three-body problem when less massive primary is an ellipsoid. During the investigation, it is found that there exist five libration points Li (i = 1, 2… 5) out of which three are collinear and two are non-collinear. We observed that the Stokes drag force does not affect the collinear libration points while non-collinear libration points are affected by it and all the libration points either collinear or non-collinear are unstable in Lyapunov sense for the given range of dissipative constant k and mass parameter µ.
Science Publishing Corporation
2016-01-13 13:52:23
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/6140
International Journal of Advanced Astronomy; Vol 4, No 1 (2016)
eng
Copyright (c) 2016 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/3582
2014-12-18T00:33:12Z
IJAA:ART
"141018 2014 eng "
2312-7414
dc
On the light emitting hot evolving black holes
B, Ramanuja Srinivas
P, Kalyani
U.V, Satya Seshavatharam
Honorary faculty, I-SERVE, Alakapuri, Hyderabad-50035, AP, India
Along with the presently believed black holes that are expected to be formed by gravitational collapse of massive star, there may exist primordial very hot evolving black holes and their origin may be interlinked with the Planck mass. Extending this proposal, the current universe can be considered as a huge evolving black hole of radius equal to the current Hubble length and temperature equal to 2.725 K. It can be suggested that 1) Vacuum is a great reservoir for matter and energy. 2) Planck mass can be considered as the primordial very hot baby black hole and can be called as the baby Planckion. 3) Baby Planckion will grow by absorbing the vacuum energy and thereby its geometric horizon also increases. As the baby Planckion is growing, its temperature and the tendency of vacuum energy absorption will decrease. 4) Very high temperature of the baby Planckion is the heat source for the evolving Planckions decreasing temperature. 5) Growing Planckion can be considered as the seed and center of any galaxy. 6) Growing Planckion will permit the emission of radiation. 6) Current universe can be considered as a huge evolving Planckion with temperature 2.725 K. In support this proposal, it is possible to guess that, in the past decreasing comic black whole temperature forced hydrogen atom to emit increased quantum of energy resulting in the observed redshift.
Keywords: Planck Scale, Planck ion, Evolving Black Holes, Black Hole Temperature, Emission of a Black Hole. CMBR Temperature, Evolving Black Hole Universe.
Science Publishing Corporation
2014-07-12 20:04:49
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/3582
International Journal of Advanced Astronomy; Vol 2, No 2 (2014)
eng
Copyright (c)
oai:ojs.pkp.sfu.ca:article/7385
2017-04-04T05:07:28Z
IJAA:ART
"170402 2017 eng "
2312-7414
dc
Modified transformation laws of coordinates and composition of velocities
Khilji, Mohd. Javed
Independent Researcher
Cosmology; Electrodynamics; Lorentz Transformation; Relative Motion; Special Relativity.
A new transformation law of coordinates is determined, which allows the inclusion of complex velocity vectors. It is found that in an isotropic universe which is filled with matter throughout, each frame can have references for its position of rest or of motion in a localized domain wherein a frame at rest does not change its position with time relative to surroundings. However, in the system, the moving frame sees only a reflection of its own motion in the rest-frame to appear it moving in antipodal direction. It is therefore, the relative motion cannot be said to be a just direction reversal with two real velocities having a single magnitude common between them; however, it is a synthesis of both real and imaginary motions. The proposed transformation laws are similar to that of Lorentz under which vector quantities be in cross product or in dot product remain invariant such as Maxwell equations. However, inherent scalar quantities such as mass, time etc. vary to distinguish rest-frame from the moving one. It is seen that the physical processes are exactly the same as Einstein predicted but without reciprocity effects and thus provide a justification of quantization of red-shift and particle decay. These considerations are useful in understanding the intricacies of the micro world such as short-lived particle, antimatter, subatomic particles, gamma rays, gamma-ray burst (GRBs), cosmic rays, dark matter, and asymmetry of Doppler’s shifting images.
Science Publishing Corporation
2016-12-09 05:12:26
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/7385
International Journal of Advanced Astronomy; Vol 5, No 1 (2017)
eng
https://www.sciencepubco.com/index.php/IJAA/article/download/7385/17544
Copyright (c) 2017 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/5302
2015-11-07T04:50:43Z
IJAA:ART
"151019 2015 eng "
2312-7414
dc
Effects of radiation and triaxiality of triangular equilibrium points in elliptical restricted three body problem
Narayan, Ashutosh
Bhilai Institute of Technology, Durg
Pandey, Krishna Kumar
Shrivastava, Sandip Kumar
ER3BP; Dynamical System ,Libration Points; Stablity
This paper studies effects of the triaxiality and radiation pressure of both the primaries on the stability of the infinitesimal motion about triangular equilibrium points in the elliptical restricted three body problem(ER3BP), assuming that the bigger and the smaller primaries are triaxial and the source of radiation as well. It is observed that the motion around these points is stable under certain condition with respect to the radiation pressure and oblate triaxiality. The critical mass ratio depends on the radiation pressure, triaxiality, semi -major axis and eccentricity of the orbits. It is further analyzed that an increase in any of these parameters has destabilizing effects on the orbits of the infinitesimal.
Science Publishing Corporation
2015-06-13 12:28:06
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/5302
International Journal of Advanced Astronomy; Vol 3, No 2 (2015)
eng
https://www.sciencepubco.com/index.php/IJAA/article/download/5302/0
https://www.sciencepubco.com/index.php/IJAA/article/download/5302/0
https://www.sciencepubco.com/index.php/IJAA/article/download/5302/0
Copyright (c) 2015 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/5834
2016-05-27T07:18:20Z
IJAA:ART
"160324 2016 eng "
2312-7414
dc
Stability of triangular equilibrium points in the Photogravitational elliptic restricted three body problem with Poynting-Robertson drag
Mishra, Vivek
B.R.A.Bihar University,Muzaffarpur
Sharma, J.P.
Ishwar, Bhola
B.R.A.Bihar University,Muzaffarpur
Triangular Points; Photogravitational; ERTBP; P-R Drag.
We have examined the stability of triangular equilibrium points in photogravitational elliptic restricted three-body problem with Poynting-Robertson drag. We suppose that smaller primary is an oblate spheroid. We have taken bigger primary as radiating. We have found the location of triangular equilibrium points and characteristic equation of the problem. We conclude that triangular equilibrium points remain unstable, different from classical case.
Science Publishing Corporation
2016-01-13 13:52:23
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/5834
International Journal of Advanced Astronomy; Vol 4, No 1 (2016)
eng
Copyright (c) 2016 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/1315
2014-11-13T03:20:10Z
IJAA:ART
"131019 2013 eng "
2312-7414
dc
Black hole Cosmos and the Micro Cosmos
UV, Satya Seshavatharam
I-SERVE, Hyderabad, AP, India.
Sr. Engineer, QA-DIP, Lanco Industries Ltd, Tirupati, AP, India.
S, Lakshminarayana
AU, AP, India
Point of big bang can be considered as the center or characteristic reference point of cosmic expansion in all directions. If so, the existence of preferred direction in the universe may not be wrong. In this paper by considering the previously proposed concepts of black hole cosmology, independent of quantum mechanics an attempt is made to fit the fine structure ratio and CMBR wavelength. It can be suggested that, 'hbar' can be considered as a cosmological increasing atomic variable related to the revolving electrons angular momentum and 'h' can be considered as a cosmological constant related to electromagnetic and thermal energy. If one is able to express the Wiens displacement constant in terms of electric charge and thermal energy constant, then automatically 'hc' can be shown to be a cosmological constant related to electromagnetic and thermal energy and with this idea the Plancks quantum nature of energy can also be understood. With the discovered applications it is very clear to say that, without a joint and unified study of cosmology and atomic & particle physics, one should not deny the concepts of black hole cosmology. Independent of the redshift observations and considering the proposed relations, with a great confidence now one can start seeing/observing the universe as a primordial expanding and light speed rotating black hole. Based on the proposed relations and concepts of black hole cosmology, definitions of cosmic homogeneity and cosmic isotropy must be re-addressed. It is also clear that, now the black hole universe is expanding in a decelerating mode at a very small rate in such a way that with current technology one cannot measure its deceleration rate. Finally it can be suggested that cosmic acceleration and dark energy can be considered as pure mathematical concepts and there exists no physical base behind their affirmation. For the most serious cosmologists this may be a bitter news, but it is a fact. Authors hope that, by 2015 definitely this subject will come into main stream physics.
Science Publishing Corporation
2013-08-05 20:17:14
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/1315
International Journal of Advanced Astronomy; Vol 1, No 2 (2013)
eng
https://www.sciencepubco.com/index.php/IJAA/article/download/1315/4167
Copyright (c)
oai:ojs.pkp.sfu.ca:article/31444
2022-01-02T03:52:52Z
IJAA:ART
"210414 2021 eng "
2312-7414
dc
Gravitation near the Schwarzschild radius
L. Khokhlov, D.
Sumy State University
Compact Object; Free Fall Pressure; Gravitation; Proton Decay; Schwarzschild Radius.
The problem of gravitation near the Schwarzschild radius is addressed. The pressure due to free fall velocity is introduced. At the Schwarz-schild radius, this pressure produces the force balancing the gravity thus stopping the collapse of the matter. The minimum radius of the source of gravity is defined as a radius at which the proton reaches the Planck energy. The compact object as a thin shell at the minimum radius is considered. The proton is assumed to decay at the Planck scale into positron and hypothetical Planck neutrinos. Under accretion onto the compact object, half the protons decay, and the other protons retain at the minimum radius.
Science Publishing Corporation
2021-01-13 09:09:11
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/31444
International Journal of Advanced Astronomy; Vol 9, No 1 (2021)
eng
Copyright (c) 2021 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/7102
2017-04-02T06:22:36Z
IJAA:ART
"170208 2017 eng "
2312-7414
dc
Dynamics in the circular restricted three body problem with perturbations
Abduljabar Ansari, Abdullah
Majmaah University
Alam, Mehtab
Hamdard University
Restricted Problem; Variable Masses; Oblate Body; Solar Radiation Pressure; Zero Velocity Curves; Poincare Surface of Sections.
This paper presents the dynamics in the restricted problem with perturbations i.e. the circular restricted three body problem by considering one of the primaries as oblate and other one having the solar radiation pressure and all the masses are variable (primaries and infinitesimal body). For finding the autonomized equations of motion, we have used the Meshcherskii transformation. We have drawn the libration points, the time series, the zero velocity curves and Poincare surface of sections for the different values of the oblateness and solar radiation pressure. Finally, we have examined the stability and found that all the libration points are unstable.
Science Publishing Corporation
2016-12-09 05:12:26
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/7102
International Journal of Advanced Astronomy; Vol 5, No 1 (2017)
eng
Copyright (c) 2017 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/4725
2015-11-07T04:50:43Z
IJAA:ART
"150617 2015 eng "
2312-7414
dc
Corrected Hawking temperature of acoustic rotating black hole
Mahanta, Chandra Rekha
Cotton College
Misra, Rajesh
Gauhati University
Black Hole; Classical Theories of Gravity; Hawking Temperature; Hawking Radiation; Tunneling Method.
In this paper, the corrected Hawking temperature of (2+1) dimensional acoustic rotating black hole has been calculated by using tunneling method. For this purpose, the r-t sector of the metric is isolated from the angular part by taking a transformation of the time and the azimuthal angle co-ordinates in the exterior region of the event horizon. The massless particle of this black hole obeys the Klein- Gordon equation of motion.
Science Publishing Corporation
2015-06-13 12:28:06
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/4725
International Journal of Advanced Astronomy; Vol 3, No 2 (2015)
eng
Copyright (c) 2015 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/11937
2018-06-05T05:51:28Z
IJAA:ART
"180605 2018 eng "
2312-7414
dc
Light speed expanding reversed black hole quantum cosmology
V. S. Seshavatharam, U
I-SERVE, Hyderabad, AP, India.Sr. Engineer, QA-DIP, Lanco Industries Ltd, Tirupati, AP, India.
Lakshminarayana, S
Andhra University, AP
Quantum cosmology; Black hole; Ordinary matter; Dark matter; Light speed expansion.
With reference to ordinary matter, dark matter, critical density and time reversed black hole physics, it seems possible to develop a model of light speed quantum cosmology.
Science Publishing Corporation
2018-03-12 14:32:08
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/11937
International Journal of Advanced Astronomy; Vol 6, No 1 (2018)
eng
Copyright (c) 2018 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/5695
2016-05-27T07:18:19Z
IJAA:ART
"160124 2016 eng "
2312-7414
dc
Simple explanation for the ‘cosmological red-shift’ and it’s evidence
Tank, Hasmukh
Cosmology; Astrophysics; Cosmological Red Shift; Pioneer Anomaly.
We first find here that the ratio of: (loss in energy of cosmologically red-shifting photon) and (loss in electrostatic potential-energy of an electron at the same distance D) remains equal to the famous ratio (G me mp) / e2 leading us towards a possibility that ‘cosmological red-shift’ may be due to gravitational effect. Also the ratio h H0 / me c2= (G me mp) / e2. So we consider three different possibilities how the reduction in energy of the photon can be understood in terms of gravitational effects; namely: (i) absorption and re-emission of intergalactic photons by the ‘virtual particles’ in space, (ii) photons have to climb the gravitational potential well produced by their own energy, and (iii) the quantum jumps of the photons causing repeated productions and collapses of gravitational fields giving rise to gravitational waves or ripples. For the purpose of comparison we express the ‘cosmological red shift’ as deceleration of the photon. Then it is argued that if such a deceleration is true for a chunk of energy called photon, then it must be true for every particle of matter too. Strikingly, the decelerations experienced by the space-probes Pioneer-10, Pioneer-11, Galileo and Ulysses, as carefully measured by Anderson J.D. ET. Al. match perfectly with the deceleration of the ‘cosmologically red-shifting photons’; thus providing supportive evidence for the simple explanation proposed here.
Science Publishing Corporation
2016-01-13 13:52:23
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/5695
International Journal of Advanced Astronomy; Vol 4, No 1 (2016)
eng
https://www.sciencepubco.com/index.php/IJAA/article/download/5695/13799
Copyright (c) 2016 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/30599
2020-07-25T22:50:02Z
IJAA:ART
"200515 2020 eng "
2312-7414
dc
Expansion of the universe and its correlation with dark energy
Tiwari, Puja
Director & ProfessorHaldia Institute of Management,India
M.N Bandyopadhyay, Prof .
Director & Professor Haldia Institute of Technology
Chatterjee, Satakshi
Assistant Professor
S. N. Bandyopadhyay, Prof.
Assistant Professor
Expansion of Universe; Dark Energy; Gravity; Photon; Black Hole; Matter; Red Shift.
The Universe is expanding and science has got the relevant amount of evidence to prove that. The red shift of the distant galaxies prove that the Universe is expanding and at a good rate. The trouble is not with the expansion rather the force that is helping in this expansion. The Four Forces that is understood by physics are Gravitational Force, Electromagnetic Force, The Weak Force and The Strong Force. The four forces mentioned above unfortunately does not help in understanding the expansion of the Universe even after 13.8 billion years from the Big Bang. Initially it was thought that the Universe had an exponential expansion just after the Big Bang and this expansion will slow down before Gravity starts contracting the Universe. Well this theory got a setback after the Red Shift of the Galaxies showed that the Universe is still expanding.
The expansion is happening still which means that the Gravitational Force is not being able to drift the galaxies towards one another. So what could be the unknown force that is repelling the galaxies from one another? Scientists have been working on this issue and many new concepts have been developed. Many scientists have argued that there is some force that is repelling the Universe but understanding this force has been difficult till now. Major scientists now agree that there is a force that is repelling the Universe and this force is not the four fundamental forces that are known to us. They have termed this force as the Dark Energy.
What is this Dark Energy is a haunting question in today’s world. Only around 5% of the observable Universe is known till date. The rest around 95% is still a mystery to us. Of that 95% around 68% is Dark Energy. So the importance of understanding this force is the need of the hour. This force can tell a lot about the formation of the Universe from the start or it can even enlighten us if the Universe is eternal.
The issue is as of now, this Dark Energy is hypothetical in nature as it has not been seen or felt by the instruments available to science today. The idea of Dark Energy goes to explain the expansion of the Universe, if Dark Energy is taken as some sort of Anti- Gravitational Force.
Einstein’s theory of relativity talks of how space and time is intermingled with gravity. According to this theory space time gets modified due to the amount of matter that falls into the space. So if a planet sits on a space in the Universe it will cause a deviation in the space time field in such a way that it will accommodate the matter of the planet. So Einstein placed time as the fourth dimension and showed its importance in space. This theory stands true in majority of the cases in the Universe. The only hurdle being that inside the Black Hole this theory falters.
Einstein and Schrodinger did interact with one another after he had understood that the Universe was expanding through the theory presented by Hubble. Earlier Einstein had stated that the Universe was Static. To counter the exigency that space time changes with matter he had proposed a constant by the name Cosmological Constant. Later he took the constant away stating that it was his blunder not to understand that the Universe was Expanding. Schrodinger had proposed to put the Cosmological Constant in the right side of the equation. This meant the constant may change with time and be considered more of a variable force. Though, Einstein later did not agree to the idea. Still it can be considered that both of them were talking about an extra force but could not come to any conclusion on this.
Einstein in his special relativity theory had talked of conversion of energy to matter with his famous equation, E=mc^2. This meant that energy can be formed by matter and matter can be converted into energy. Though energy created from matter can be seen in Atom Bomb but matter created from energy is not seen. This paper will try to show how matter can be created from energy where Dark Energy acts as a Catalyst.
This paper also tries to analyze the concept of Dark Energy as a non interacting supermassive energy (NISE). The paper will try to see the relationship between expanding Universe and Dark energy. The paper will try to develop a new spectrum that can make Dark Energy or NISE as stated in the paper visible or understandable. The paper will also like to see the relationship between Dark Energy and Photon. The paper will try to show how energy is converted from matter with the help of Dark Energy.
Science Publishing Corporation
2020-05-15 08:38:40
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/30599
International Journal of Advanced Astronomy; Vol 8, No 1 (2020)
eng
Copyright (c) 2020 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/31262
2022-01-02T03:52:52Z
IJAA:ART
"210113 2021 eng "
2312-7414
dc
Occurrence characteristics of equatorial plasma bubbles over Kisumu, Kenya during Solar maximum of Solar Cycle 24
Nyongesa, Edward
Masinde Muliro university of science and technology
Boniface, Ndinya
Masinde Muliro University of science and technology
George, Omondi
Maseno University
Equatorial Plasma Bubbles; Total Electron Content; Rate of Change of TEC; Rate of Change of TEC Index; Solar Cycle 24.
Equatorial Plasma Bubbles (EPBs) are irregular plasma density depletions in the ambient electron density in the equatorial F-region ionosphere generated after sunset. EPBs are known to bring disruptions to telecommunication and navigation systems. This paper investigates the occurrence of EPBs over Kisumu, Kenya (Geomagnetic coordinates: 9.64o S, 108.59o E; Geographic coordinates: 0.02o S, 34.6o E) for a few selected quiet and storm days between 1st January 2013 and 31st December 2014 which was a high Solar activity period for Solar Cycle 24. The study brings out EPB occurrence pattern over Kisumu, Kenya for the selected quiet and storm days of 2013 and 2014. The Receiver Independent Exchange (RINEX) data was retrieved from the Kisumu high data-rate NovAtel GSV4004B SCINDA-GPS receiver. The data was unzipped and processed to obtain Vertical Total Electron Content (VTEC), amplitude scintillation (S4) and Universal Time (UT) which were then fed into MATLAB to generate VTEC and S4 plots against UT for each selected quiet and storm day within the years 2013 and 2014. The Total Electron Content (TEC) depletion depths and S4 index values between 16:00 and 20:00 UT for each selected quiet and storm day were extracted from the VTEC and S4 plots and used to plot TEC depletion depths and S4 plots. The Rate of Change of TEC (ROT) and Rate of Change of TEC Index (ROTI) between 16:00 and 20:00 UT were generated from VTEC and used to plot ROT and the corresponding ROTI plots against UT. TEC depletion depths and ROTI values for each selected quiet and storm day between 16:00 and 20:00 UT were extracted and used to plot TEC depletion depths and ROTI plots and S4 index and ROTI plots. In this study, the enhancement of S4 index corresponded well with TEC depletions, increased fluctuation of ROT and higher ROTI values between 16:00UT and 20:00UT for most days. This correspondence was used in inferring the occurrence of EPBs during the selected quiet and storm days of the years 2013 and 2014. The obtained results showed that the highest EPB occurrence was during March equinox with 33.33% occurrence in the year 2013 and 30.76% occurrence in the year 2014, followed by the September equinox which had 20.38% occurrence in 2013 and 17.26% occurrence in 2014. The seasonal variation of EPB occurrence was attributed to the variation in the daytime E x B drift velocities. Larger E x B drift velocities resulted in increased EPB occurrence in the equinoctial period (March, April, August and September) and November solstice period (November and December) while lower E x B drift velocities resulted in reduced EPB occurrence in the June solstice period (June and July). The percentage EPB occurrence in the year 2013 was 6.49% while in the year 2014 was 4.32%. The storm period had percentage EPB occurrence of 21.42% in the year 2013 and 21.88% in the year 2014 while the quiet period had percentage EPB occurrence of 18.75% in the year 2013 and 7.89% in the year 2014. These results clearly showed that the percentage EPB occurrence was higher during the storm period than in the quiet period. Hence the development of EPBs was enhanced by geomagnetic activity through several competing dynamics such as Prompt Penetration Electric Field (PPEF), Disturbance Dynamo Electric Field (DDEF) and reduction in electron density due to increased recombination rates.
Science Publishing Corporation
2021-01-13 09:09:11
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/31262
International Journal of Advanced Astronomy; Vol 9, No 1 (2021)
eng
Copyright (c) 2021 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/6799
2016-11-19T02:43:37Z
IJAA:ART
"161117 2016 eng "
2312-7414
dc
Final unification with three gravitational constants associated with nuclear, electromagnetic and gravitational interactions
UV, Satya Seshavatharam
I-SERVE, Hyderabad, AP, India.Sr. Engineer, QA-DIP, Lanco Industries Ltd, Tirupati, AP, India.
S, Lakshminarayana
Andhra university, India
Final Unification; Gravitational Constants Associated with Strong and Electromagnetic Interactions.
By introducing two large pseudo gravitational constants assumed to be associated with strong and electromagnetic interactions, we make an attempt to combine the old Abdus Salam’s ‘strong gravity’ concept with ‘Newtonian gravity’ and try to understand the constructional features of nuclei, atoms and neutron stars in a unified approach. From the known elementary atomic and nuclear physical constants, estimated magnitude of the Newtonian gravitational constant is (6.66 to 6.70) x10-11 m3/kg/sec2. Finally, by eliminating the proposed two pseudo gravitational constants, we inter-related the Newtonian gravitational constant, Fermi’s weak coupling constant and Strong coupling constant, in a generalized approach.
Science Publishing Corporation
2016-07-05 19:27:41
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/6799
International Journal of Advanced Astronomy; Vol 4, No 2 (2016)
eng
https://www.sciencepubco.com/index.php/IJAA/article/download/6799/16237
Copyright (c) 2016 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/4391
2015-04-28T13:36:30Z
IJAA:ART
"150324 2015 eng "
2312-7414
dc
New mechanism for the cosmological red-shift explaining: non-observation of dark energy, large-number- coincidence and the cosmic coincidence
Tank, Hasmukh K.
Indian Space Research Organization
Cosmology; Cosmological Red-Shift; Dark-Energy; Large-Number-Coincidence; Cosmic-Coincidence.
Accepting Einstein’s General Relativity Theory, that the changes in the gravitational field can propagate at the speed of light, it is proposed here that: before an electron in an atom emits a photon, the energy (h f0) of the photon was a part of total energy of the atom; contributing to establish the gravitational-field around the atom. As soon as an electron in that atom emits a photon of energy h f0, and the photon starts moving away from the atom, the gravitational-field around the atom partly reduces, proportional to the photon’s energy h f0, and this wave of ‘reduced gravitational field’ propagates radially-outwards at the speed of light. And a part of energy of the photon gets spent in “filling” the ‘gravitational potential-well’ produced by its energy, when it was a part of energy of the atom. From the derivation presented here we find that the energy spent by the photon to “fill” the ‘gravitational potential-well’, during its inter-galactic journey manifests as the ‘cosmological red-shift’. And the so called ‘total-mass-of-the-universe'’ and ‘radius-of-the-universe'’ are just mathematically-equivalent mass and distance arising while converting electrostatic potential-energy into gravitational potential-energy. This is the reason why we find the large-number-coincidence (LNC). And since there is no expansion of the universe, there is no ‘cosmic coincidence’, that why only in this epoch we find the ‘large-number-coincidence’!
Science Publishing Corporation
2015-01-02 05:05:40
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/4391
International Journal of Advanced Astronomy; Vol 3, No 1 (2015)
eng
Copyright (c) 2015 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/8168
2017-10-21T09:16:30Z
IJAA:ART
"171020 2017 eng "
2312-7414
dc
FLRW solution in bimetric theory of gravitation
Borkar, M. S.
Ameen, Abdul
J D I E T, Yavatmal
FLRW Model; Bimetric Theory of Gravitation; Cosmology; Isotropy.
We have derived FLRW line-element in Bimetric Theory of Gravitation (BTG) by solving Rosen’s field equations, and it is concluded that the geometry of our model in BTG is agreed with the geometry of FLRW model in GR. It is also realized that for the large value of t, the deceleration parameter q in our model admits the value which is close to the value at present epoch predicted by the observations of [44-48].This This shows that our FLRW model in BTG is found to be in an accelerating phase at present epoch which is not the case in GR. Other geometrical and physical aspects to the model are also studied.
Science Publishing Corporation
2017-07-06 04:38:27
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/8168
International Journal of Advanced Astronomy; Vol 5, No 2 (2017)
eng
Copyright (c) 2017 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/29377
2019-11-05T02:48:34Z
IJAA:ART
"190904 2019 eng "
2312-7414
dc
Locations of Lagrangian points and periodic orbits around triangular points in the photo gravitational elliptic restricted three-body problem with oblateness
Johnson, Ancy
Department of Aerospace EngineeringKarunya UniversityCoimbatore-641114Tamilnadu, India
Krishan Sharma, Ram
Critical Mass; ER3BP; Oblateness; Oblate Spheroid; Lagrangian Points; Photogravitational; Radiation Pressure; Transition Curve; Tadpole Orbits.
Locations of the Lagrangian points are computed and periodic orbits are studied around the triangular points in the photogravitational elliptic restricted three-body problem (ER3BP) by considering the more massive primary as the source of radiation and smaller primary as an oblate spheroid. A new mean motion taken from Sharma et al. [13] is used to study the effect of radiation pressure and oblateness of the primaries. The critical mass parameter that bifurcates periodic orbits from non-periodic orbits tends to reduce with radiation pressure and oblateness. The transition curves defining stable region of orbits are drawn for different values of radiation pressure and oblateness using the analytical method of Bennet [14]. Tadpole orbits with long- and short- periodic oscillations are obtained for Sun-Jupiter and Sun-Saturn systems.
Science Publishing Corporation
2019-09-03 06:44:23
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/29377
International Journal of Advanced Astronomy; Vol 7, No 2 (2019)
eng
Copyright (c) 2019 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/6227
2016-11-17T12:27:34Z
IJAA:ART
"160705 2016 eng "
2312-7414
dc
Resonance in the perturbations of a synchronous satellite due to angular rate of the earth-moon system around the sun and the earth’s rotation rate
Yadav, Sushil
Assistant ProfessorDepartment of MathematicsMaharaja Agrasen CollegeUniversity of Delhi
Aggarwal, Rajiv
Associate Professor, Department of Mathematics, Sri Aurobindo College, University of Delhi
Kaur, Bhavneet
Assistant Professor, Department of Mathematics, Lady Shri Ram College, University of Delhi
Earth Oblateness; Perturbations; Resonance; Synchronous Satellite.
This paper investigates resonances in the perturbations of a synchronous satellite including its latitude, angular rate of the earth-moon system around the sun and the earth’s rotation rate about its axis. This is found that resonances occur due to the commensurability between (i) angular velocity of the satellite and angular rate of earth’s rotation about its axis and (ii) angular rate of the earth-moon system around the sun and angular rate of the rotation of the earth. Amplitude and time-period of the oscillation at the resonance points are determined using the procedure of Brown and Shook [3]. Effect of (orbital angle of the mass-centre of the earth-moon system around the sun) on amplitude and time period is also analyzed. It is found that for increasing the values of from to amplitude decreases and time period also decreases. Effect of time on the latitude of the satellite including earth oblateness is also studied. It is seen that for increasing the value of , there is a small change in , the latitude of the synchronous satellite.
Science Publishing Corporation
2016-07-05 19:27:41
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/6227
International Journal of Advanced Astronomy; Vol 4, No 2 (2016)
eng
Copyright (c) 2016 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/3585
2014-12-18T00:33:12Z
IJAA:ART
"141020 2014 eng "
2312-7414
dc
On the evolving and emitting quantum black holes and the scale independent black hole cosmology
Satya Seshavatharam, U.V
I-SERVE, Hyderabad, AP, India.
Sr. Engineer, QA-DIP, Lanco Industries Ltd, Tirupati, AP, India.
Lakshminarayana, S
Andhra University, AP, India
Along with presently the believed black holes that are expected to be formed by gravitational collapse of a massive star, there may exist primordial evolving black holes. By absorbing the hidden vacuum energy primordial evolving black holes become massive. Planck mass can be considered as the basic mass of any black hole and can be called as the baby Planckion. Very high temperature of the baby Planckion is the only heat source for the evolving black holes or evolving Planckions decreasing temperature. Considering the current cosmic microwave back ground temperature as a quantum gravitational effect of the evolving primordial cosmic black hole, general theory of relativity and quantum mechanics can be combined into a scale independent true unified model of quantum gravity. Considering cosmic black holes light speed rotation and galactic revolution, observed galactic rotational curves can be understood. In the past, decreasing high cosmic black hole temperature forced hydrogen atom to emit increasing photon energy resulting in the observed redshift. Aged super novae dimming may be due to the effect of past high cosmic black hole temperature. As cosmic time passes, decreasing current cosmic black hole temperature makes hydrogen atom to emit increased quanta of energy causing the future redshift. In future, with reference to the laboratory hydrogen atom, decreasing current cosmic temperature and measured rate of increase in emitted photon energy - true rate of future cosmic expansion can be understood. With reference to the decreasing current Hubble constant and decreasing current cosmic black hole temperature, true rate of future cosmic expansion can also be understood. Foundations of Quantum mechanics and General theory of relativity may be reviewed in this unified way.
Keywords: Quantum Gravity, Evolving Black Holes, Geometric Horizon, Standard Cosmology, Black Hole Cosmology, CMBR Isotropy and Anisotropy, Redshift, Galactic Rotational Curves.
Science Publishing Corporation
2014-07-12 20:04:49
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/3585
International Journal of Advanced Astronomy; Vol 2, No 2 (2014)
eng
Copyright (c)
oai:ojs.pkp.sfu.ca:article/7776
2017-10-20T06:55:18Z
IJAA:ART
"170706 2017 eng "
2312-7414
dc
Progression of bifurcated family f type periodic orbits in the circular restricted three-body problem
Pushparaj, Nishanth
Department of Aerospace Engineering, Karunya University, Coimbatore - 641114, Tamil Nadu, India
Sharma, Ram Krishan
Department of Aerospace Engineering, Karunya University, Coimbatore - 641114, Tamil Nadu, India
Restricted Three-Body Problem; Poincaré Surfaces of Section; Solar Radiation Pressure; Sun-Jupiter System; Direct and Retrograde Periodic Orbit.
Progression of f-type family of periodic orbits, their nature, stability and location nearer the smaller primary for different mass ratios in the framework of circular restricted three-body problem is studied using Poincaré surfaces of section. The orbits around the smaller primary are found to decrease in size with increase in Jacobian Constant C, and move very close towards the smaller primary. The orbit bifurcates into two orbits with the increase in C to 4.2. The two orbits that appear for this value of C belong to two adjacent separate families: one as direct orbit belonging to family g of periodic orbits and other one as retrograde orbit belonging to family f of periodic orbits. This bifurcation is interesting. These orbits increase in size with increase in mass ratio. The elliptic orbits found within the mass ratio 0 < µ ≤ 0.1 have eccentricity less than 0.2 and the orbits found above the mass ratio µ > 0.1 are elliptical orbits with eccentricity above 0.2. Deviations in the parameters: eccentricity, semi-major axis and time period of these orbits with solar radiation pressure q are computed in the frame work of photogravitational restricted Three-body problem in addition to the restricted three-body problem. These parameters are found to decrease with increase in the solar radiation pressure.
Science Publishing Corporation
2017-07-06 04:38:27
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/7776
International Journal of Advanced Astronomy; Vol 5, No 2 (2017)
eng
https://www.sciencepubco.com/index.php/IJAA/article/download/7776/18284
Copyright (c) 2017 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/5304
2015-11-07T04:50:43Z
IJAA:ART
"151023 2015 eng "
2312-7414
dc
Trajectories of the infinitesimal mass around the triangular equilibrium points in elliptical restricted three bodies problem under oblate and radiating primaries for the binary systems
Singh, Nutan
Narayan, Ashutosh
Bhilai Institute of Technology, Durg
Ishwar, B.
Radiation Pressure; Triangular Points; Oblateness Parameters; Trajectory of Infinitesimal Stability.
This paper describes the trajectory of the infinitesimal mass around L4 of the triangular equilibrium points for the binary systems in the elliptical restricted three body’s problem (ERTBP), where both oblate primaries are radiating. The solutions for the perturbed motion in the vicinity of L4 is given by u(f) and v(f) function .The stability of the infinitesimal mass around the triangular points is also studied by plotting u(f) and v(f) curve. It is found that radiation pressure, oblateness and eccentricity show a significant effect on the trajectory and stability of the infinitesimal mass around the triangular equilibrium points. Simulation technique has been used to design the trajectory of the binary systems (Achird, Luyten, α Cen AB, Kruger-60 and Xi-Bootis).
Science Publishing Corporation
2015-06-13 12:28:06
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/5304
International Journal of Advanced Astronomy; Vol 3, No 2 (2015)
eng
Copyright (c) 2015 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/5928
2016-05-27T07:18:20Z
IJAA:ART
"160328 2016 eng "
2312-7414
dc
Non-collinear libration points in CR3BP when less massive primary is an heterogeneous oblate body with N-layers
Idrisi, M Javed
School of Physical and Molecular SciencesDepartment of MathematicsAl-Falah UniversityFaridabad (Haryana) - 121004
Shalini, Kumari
Deshbandhu College, New Delhi
Celestial Mechanics; Restricted Three-Body Problem; Libration Points; Stability; Heterogeneous Oblate Spheroid.
In the present paper, the existence of non-collinear libration points has been shown in circular restricted three-body problem when less massive primary is a heterogeneous oblate body with N-layers. Further, the stability of non-collinear libration points is investigated in linear sense and found that the non-collinear libration points are stable for the critical value of mass parameter µ ≤ µcrit= µo – 3.32792 k1 – 1.16808 k2.
Science Publishing Corporation
2016-01-13 13:52:23
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/5928
International Journal of Advanced Astronomy; Vol 4, No 1 (2016)
eng
Copyright (c) 2016 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/2244
2014-11-13T03:20:13Z
IJAA:ART
"140429 2014 eng "
2312-7414
dc
Discovery of the antigraviton verified by the rotation curve of NGC 6503
WONG, Wing-hong
China Evangelical Seminary
WONG, Wing-to
China Evangelical Seminary
WONG, Wing-keung
China Evangelical Seminary
WONG, Ling-mei
China Evangelical Seminary
Using special relativity theory, it was discovered that to each graviton, there coexists its antiparticle, an antigraviton. Building on this discovery and quantum theory, a new quantum gravity theory (QGT) was invented, providing equations of the gravitational potential, the graviton wavelength, and the circular speed, without the dark matter hypothesis (DMH). According to this QGT, the gravitational scale-length of a spiral galaxy depends on its mass distribution, being approximately equal to 1.5708 times the radius of its radial center of mass. Also Newtonian gravity theory (NGT) is of limited validity: if the radius is less than the gravitational scale-length, NGT is exact; but if the radius is greater than the gravitational scale-length, it becomes inadequate, and is surpassed by QGT. When the theoretical rotation curve was compared with the rotation curve of the galaxy NGC6503, the QGT was verified within the rms error of the measured rotation speeds, 3.0 percent. It was also demonstrated how two formulas of general relativity theory (Schwarzschild metric, gravitational time dilation) may be revised by the QGT, and thus be upgraded to formulas of quantum general relativity theory. It is suggested the so-called dark matter problem can be solved by discarding the DMH and adopting our new QGT.
Keywords: Cosmology: Theory, Dark Matter, Galaxies: Kinematics and Dynamics, Galaxies: Individual (NGC6503), Gravitation, Large-Scale Structure of Universe.
Science Publishing Corporation
2014-04-29 11:48:19
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/2244
International Journal of Advanced Astronomy; Vol 2, No 1 (2014)
eng
Copyright (c)
oai:ojs.pkp.sfu.ca:article/31627
2022-01-02T03:57:20Z
IJAA:ART
"220102 2022 eng "
2312-7414
dc
Periodic orbit in the photo-gravitational restricted three body problem around the collinear Lagrangian points when more massive primary is an oblate spheroid and source of radiation
John, Derick
Karunya Institute of Technology and Sciences
Krishan Sharma, Ram
Karunya Institute of Technology and Sciences
Angular Frequency; Collinear Lagrangian Points; Oblateness; Periodic Orbits; Radiation Pressure; Restricted Three Body Problem.
The circular Restricted Three Body Problem is considered with the more massive primary as an oblate spheroid and source of radiation. A new mean motion expression given by n2=1+6A is used in the present study, when the secular effect of the oblateness on the mean motion, argument of perigee and right ascension of the ascending node is considered. The locations of the collinear Lagrangian points are found. It is found to have some variation from the previous study conducted on the same because of the new mean motion that is considered in this study. The variations of the location of the Lagrangian points due to the unperturbed as well as the perturbed problem due to oblateness and radiation pressure are studied. A study on the eccentricity e and angular frequency s at L1, L2 and L3 is carried out. It is observed how the change in effect of oblateness and radiation pressure has affected the location, angular frequency and eccentricity at L3, though there are only small changes noticed in the case of L1 and L2.
Science Publishing Corporation
2021-01-13 09:09:11
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/31627
International Journal of Advanced Astronomy; Vol 9, No 1 (2021)
eng
Copyright (c) 2022 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/7025
2017-04-02T06:22:36Z
IJAA:ART
"170217 2017 eng "
2312-7414
dc
Pulsating curves of zero velocity for infinitesimal mass around oblate and triaxial rigid body of triangular equilibrium points in elliptical restricted three body problem
Singh, Nutan
Bhilai Institute of Technology, Durg
Narayan, A.
Er3bp;Triaxiality; Dynamical System; Zero Velocity Curve; Triangular Points.
This paper explore pulsating Curves of zero velocityof the infinitesimal mass around the triangular equilibrium points with oblate and triaxial rigid body in the elliptical restricted three body problem(ER3BP).
Science Publishing Corporation
2016-12-09 05:12:26
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/7025
International Journal of Advanced Astronomy; Vol 5, No 1 (2017)
eng
Copyright (c) 2017 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/4772
2015-11-07T04:50:43Z
IJAA:ART
"150623 2015 eng "
2312-7414
dc
Non- linear stability of triangular librations points in circular restricted three body under radiating and oblate primaries in presence of resonance
Narayan, Ashutosh
Bhilai Institute of Technology, Durg
Singh, Nutan
ER3BP; Hamiltonian Functions; Triangular Libration Points; Resonance.
The nonlinear stability of the triangular librations points is studied in the presence resonance considering both the primaries as radiating and oblate. The study is carried out for various values of radiation pressure and oblateness parameter in general and binary systems in particular. It is found that the normal forms of the Hamiltonian contains both the resonance cases; ω1= 2ω2 and ω1= 3ω2. The case ω1= ω2 corresponds to the boundary region of the stability for the system.It is investigated that for the motion is unstable for third order resonance but stable for fourth order resonance.
Science Publishing Corporation
2015-06-13 12:28:06
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/4772
International Journal of Advanced Astronomy; Vol 3, No 2 (2015)
eng
Copyright (c) 2015 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/13561
2018-08-04T01:01:20Z
IJAA:ART
"180804 2018 eng "
2312-7414
dc
Holographic Dark Energy Model With Time Varying Deceleration Parameter
P. Wankhade, R
Jawaharlal Darda Institute of Engg. & Tech., Yavatmal (M.S)India-445001
Bianchi Type-I Space-Time; Time Varying Deceleration Parameter; Holographic Dark Energy.
Two minimally interacting fluids; dark matter and holographic dark energy components has been studied in a spatially homogeneous and anisotropic Bianchi type-I space-time. The solutions of the Einstein’s field equations are obtained under the assumption of time varying deceleration parameter (Abdussattar and S. Prajapati, Astrophys. Space Sci. 331, 65, 2011) which represents transition of the universe from the early decelerating phase to the recent accelerating phase. It is shown that for large expansion the model reduces to model while for suitable choice of interaction between dark matter and holographic dark energy the anisotropy parameter of the universe approaches to zero for large cosmic time and the coincidence parameter increases with increase in time. Allowing for time dependent deceleration parameter the solutions of the field equations and some physical and geometric properties of the model along with physical acceptability of the solutions have also been discussed in details.
Science Publishing Corporation
2018-07-25 08:50:29
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/13561
International Journal of Advanced Astronomy; Vol 6, No 2 (2018)
eng
Copyright (c) 2018 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/5831
2016-05-27T07:18:19Z
IJAA:ART
"160308 2016 eng "
2312-7414
dc
Stability of the equilibrium points in the circular restricted four body problem with oblate primary and variable mass
Abduljabar Ansari, Abdullah
Majmaah University
Asymptotically Stable; Circular Restricted Four Body Problem; Isosceles Triangular Configuration; Oblateness Factor; Variable Mass.
This paper investigates the liberation points and stability of the restricted four body problem with one of the primaries as oblate body and the infinitesimal body is taken as variable mass. Due to oblateness, the equilateral triangular configuration is no longer exists and becomes an isosceles triangular configuration. Moreover, we have found seven equilibrium points out of which three are asymptotically stable (dark black in the tables) and rest four are unstable.
Science Publishing Corporation
2016-01-13 13:52:23
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/5831
International Journal of Advanced Astronomy; Vol 4, No 1 (2016)
eng
Copyright (c) 2016 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/28714
2020-07-25T22:50:02Z
IJAA:ART
"200712 2020 eng "
2312-7414
dc
Effectiveness of KS elements in satellite orbit prediction using earth's gravity, drag and solar radiation pressure
R. Saritha Kumari, T.
Vikram Sarabhai Space Centre
Xavier James Raj, M.
Applied Mathematics Division, Vikram Sarabhai Space Centre, Thiruvananthapuram
Orbit Prediction; Solar Radiation Pressure; Semi-Major Axis; KS Elements.
Satellite moving under the gravitational field of Earth deviates from its two-body elliptic orbit, due to the combined effects of the gravitational field of Earth, atmospheric drag, solar radiation pressure, third-body gravitational effects, etc. This paper utilizes the KS regular element equations to solve Newtonian equations of motion to obtain numerical solution with respect to perturbing forces, like, Earth's gravity (includes zonal, sectorial and tesseral harmonics terms), atmospheric drag and solar radiation pressure. Effectiveness of the theory is illustrated by comparing the results with some of the existing theories in literature.
Science Publishing Corporation
2020-05-15 08:38:40
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/28714
International Journal of Advanced Astronomy; Vol 8, No 1 (2020)
eng
https://www.sciencepubco.com/index.php/IJAA/article/download/28714/58602
Copyright (c) 2020 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/31301
2022-01-02T03:52:52Z
IJAA:ART
"210121 2021 eng "
2312-7414
dc
Diagnostics of interstellar medium parameters on non-discrete timing irregularities of pulsars
U. Iyida, E.
Department of Physics and Astronomy,Univeresity of Nigeria, Nsukka
I. Eze, C.
Department of Physics and Astronomy,Univeresity of Nigeria, Nsukka
Methods: Statistical; Pulsars: General; Interstellar Medium: General.
In this paper, a large homogenous sample of Jodrell Bank Observatory (JBO) radio pulsars was used to investigate the statistical effects of interstellar medium (ISM) parameters: dispersion and rotation measure (DM and RM, respectively) on non-discrete timing irregularities of our sample (whose observed timing activity timescales span over 40 years). This is done by using the correlations between the measured DM and RM, and some parameters that have been commonly used to measure non-discrete timing irregularities [timing activity parameter (A), the amount of timing fluctuations absorbed by the cubic term (σR23), measure of pulsar rotational stability (σz ) and stability parameter (∆8)]. Our results show that ISM parameters positively correlate (r > 0.60) with the pulsar timing irregularities parameters of our sample. The significant relationships observed are discussed.
Science Publishing Corporation
2021-01-13 09:09:11
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/31301
International Journal of Advanced Astronomy; Vol 9, No 1 (2021)
eng
Copyright (c) 2021 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/6852
2017-04-02T06:22:36Z
IJAA:ART
"161209 2016 eng "
2312-7414
dc
A study of libration points in CR3BP under albedo effect
Idrisi, M Javed
School of Physical and Molecular SciencesDepartment of MathematicsAl-Falah UniversityFaridabad (Haryana) - 121004
Restricted Three-Body Problem; Radiation Pressure; Albedo Effect; Libration Points; Stability.
In this paper this is investigated how albedo perturbed the libration points from its original position? It is found that there exist five libration points, three collinear and two non-collinear and all the libration points are affected by Albedo. The non-collinear libration points are stable for a critical value of mass parameter µ ≤ µc, where µc = µo − (0.00891747 + 0.222579k)α (µo is the critical mass parameter for classical case) but collinear libration points are still unstable.
Science Publishing Corporation
2016-12-09 05:12:26
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/6852
International Journal of Advanced Astronomy; Vol 5, No 1 (2017)
eng
Copyright (c) 2016 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/4334
2015-04-28T13:36:30Z
IJAA:ART
"150324 2015 eng "
2312-7414
dc
Higher order resonance stability of triangular libration points for radiating primaries in ER3BP
Narayan, Ashutosh
Bhilai Institute of Technology, Durg
Singh, Nutan
ER3BP; Hamiltonian Functions; Triangular Libration Points; Resonance; KAM Theory.
The main aim of this paper is to study the existence of resonance and stability of the triangular equilibrium points in the framework of ER3BP when both the attracting bodies are sources of radiation at w1=w2, w1=2w2, w1=3w2 in both circular and elliptical cases .A practical application of this model could be seen in the case of binary systems ( Achird, Luyten, α Cen- AB, Kruger 60, Xi Bootis). The study is carried out both analytically and numerically by considering various values of radiation pressures and around binary systems .In both cases (CR3BP and ER3BP) it is found that w1=w2 corresponds to the boundary region of the stability for the system, whereas the other two cases w1=2w2, w1=3w2 correspond to the resonant cases. In order to investigate the stability, the Hamiltonian is normalized up to the fourth order by using linear canonical transformation of variables. Then KAM theorem is applied to investigate the stability for different values of radiation pressures in general and around the binary systems in particular. Finally, simulation technique is applied to study the correlation between radiation pressures and mass ratio in circular case; mass ratio and eccentricity in elliptical case. It is found that all the binary systems considered are stable. Also, it is found that except for some values of the radiation pressure parameters and for m<=mc =0.0385209 the triangular equilibrium points are stable.
Science Publishing Corporation
2015-01-02 05:05:40
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/4334
International Journal of Advanced Astronomy; Vol 3, No 1 (2015)
eng
https://www.sciencepubco.com/index.php/IJAA/article/download/4334/0
Copyright (c) 2015 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/9358
2018-06-05T05:49:38Z
IJAA:ART
"180312 2018 eng "
2312-7414
dc
LRS Bianchi type-I Universe with anisotropic dark energy and special form of deceleration parameter in f (R, T) gravity
Wankhade, Rajesh
Jawaharlal Darda Institute of Engg. & Tech., Yavatmal (M.S)India-445001
Bansod, A.S.
LRS Bianchi Type-I Space-Time; Special Form of Deceleration Parameter; Gravity.
In this paper, LRS Bianchi type-I space-time is considered in the presence of perfect fluid source in the frame work of gravity (Harko et al. in Phys.Rev. D 84:024020, 2011) where is an arbitrary function of Ricci scalar and trace of the energy momentum tensor . The Einstein’s field equations have been solved by taking into account the special form of deceleration parameter (Singha A., Debnath U.: Int.J. Theor. Phys.48, 2009). We observe that in f (R, T) gravity, an extra acceleration is always present due to coupling between matter and geometry. The geometrical and physical aspect of the model is also studied.
Science Publishing Corporation
2018-03-12 14:32:08
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/9358
International Journal of Advanced Astronomy; Vol 6, No 1 (2018)
eng
Copyright (c) 2018 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/29428
2019-11-05T02:48:34Z
IJAA:ART
"190920 2019 eng "
2312-7414
dc
Applying He's variational iteration method to FRW cosmology
K.Shchigolev, V.
Department of Theoretical Physics, Ulyanovsk State University
Approximate Solution; FRW Cosmological Models; Dynamical System Analysis; Variational Iteration Method.
This work is devoted to the investigation of Friedmann-Robertson-Walker (FRW) cosmological models with the help of the so-called Variational Iteration Method (VIM). For this end, we briefly recall the main equations of the cosmological models and the basic idea of VIM. In order to approbate the VIM in FRW cosmology and demonstrate the main steps in solving by this method, we consider the test example of the universe with dust for which the exact solution of the model is known. Then, a solution for the spatially flat FRW model of the universe filled with the dust and quintessence is obtained when the exact analytic solution cannot be found. A comparison of our solution with the corresponding numerical solution shows that it is of a high degree of accuracy. Moreover, the Dynamical System Analysis to the dynamics of the homogeneous and isotropic FRW universes is used as a special case of generalized Lotka–Volterra system where the competitive species are the barotropic fluids filling the Universe. With the help of VIM, we have found the iterative formulae for the density parameters of the cosmological analog of the generalized Lotka–Volterra set of equations. All solutions illustrated graphically by means of Maple software.
Science Publishing Corporation
2019-09-03 06:44:23
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/29428
International Journal of Advanced Astronomy; Vol 7, No 2 (2019)
eng
Copyright (c) 2019 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/6251
2016-11-17T12:27:34Z
IJAA:ART
"160829 2016 eng "
2312-7414
dc
On the stability of L4,5 in the perturbed relativistic R3BP with a triaxial bigger primary
Nakone, Bello
Usmanu Danfofiyo University,Sokoto
Singh, Jagadish
Celestial Mechanics; Perturbation; Relativity; Triaxiality; R3BP.
In the present paper, we endeavor to study the stability of triangular points under the influence of small perturbations in the Coriolis and centrifugal forces, together with the triaxiality of the bigger primary in the framework of the relativistic R3BP. It is observed that the locations of these points are affected by the relativistic factor, triaxiality and a small perturbation in the centrifugal force, but are unaffected by that of the Coriolis force. It is also seen that for these points the range of stability region increases or decreases according as equation (14) without is greater or less than zero.
Science Publishing Corporation
2016-07-05 19:27:41
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/6251
International Journal of Advanced Astronomy; Vol 4, No 2 (2016)
eng
Copyright (c) 2016 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/3751
2014-12-18T00:33:12Z
IJAA:ART
"141124 2014 eng "
2312-7414
dc
On the combined role of the astrophysical force limit and Avogadro number in final unification
UV, Satya Seshavatharam
I-SERVE, Hyderabad, AP, India.Sr. Engineer, QA-DIP, Lanco Industries Ltd, Tirupati, AP, India.
S, Lakshminarayana
Andhra university, India
Classical Force Limit; Avogadro number; Schwarzschild’s Interaction; Final Unification.
Magnitude of the unified force can be assumed to be equal to the classical or astrophysical force limit . Strength of any interaction can be defined as the ratio of the operating force magnitude and the magnitude of . Let the gravitational interaction taking place at black holes be called as ‘Schwarzschild interaction’. If strength of Schwarzschild interaction is unity, then weak interaction strength seems to be times less than the Schwarzschild interaction and strong interaction strength seems to be times less than the Schwarzschild interaction. Based on these concepts and considering the Avogadro number as an absolute and discrete number, basics of final unification can be understood.
Science Publishing Corporation
2014-07-12 20:04:49
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/3751
International Journal of Advanced Astronomy; Vol 2, No 2 (2014)
eng
Copyright (c) 2014 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/7931
2017-10-20T06:55:18Z
IJAA:ART
"170820 2017 eng "
2312-7414
dc
Diagonalization of Hamiltonian in the photogravitation-al restricted three body problem with P-R drag
James Raj, Xavier
Vikram Sarabhai Space Centre
Ishwar, Bhola
BRA Bihar University
Hamiltonian, Normalization, Photogravitational, P-R drag, RTBP.
In this paper, restricted, three-body problem (RTBP) is generalised to study the non-linear stability of equilibrium points in the photogravitational RTBP with P-R drag. In the present study, both primaries are considered as a source of radiation and effect of P-R drag. Hence the problem will contain four parameters q1, q2, W1 and W2. At first, the Lagrangian and the Hamiltonian of the problem were computed, then the Lagrangian function is expanded in power series of the coordinates of the triangular equilibrium points x and y. Lastly, diagonalized the quadratic term of the Hamiltonian of the problem, which is obtained by expanding original Lagrangian or Hamiltonian by Taylor's series about triangular equilibrium point. Finally, the study concluded that the diagonalizable Hamiltonian is H2=ω1I1-ω2I2.
Science Publishing Corporation
2017-07-06 04:38:27
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/7931
International Journal of Advanced Astronomy; Vol 5, No 2 (2017)
eng
Copyright (c) 2017 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/5401
2015-11-07T10:52:09Z
IJAA:ART
"151105 2015 eng "
2312-7414
dc
Scalar field cosmology in Lyra's geometry
Shchigolev, V. K.
Department of Theoretical Physics, Ulyanovsk State University
Semenova, E. A.
Department of Theoretical Physics, Ulyanovsk State University
Cosmology; Lyra's Geometry; Phantom; Scalar Field; Tachyon Field.
The new classes of homogeneous cosmological models for the scalar fields are build in the context of Lyra’s geometry. The different types of exact solution for the model are obtained by applying two procedures, viz the generating function method and the first order formalism.
Science Publishing Corporation
2015-06-13 12:28:06
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/5401
International Journal of Advanced Astronomy; Vol 3, No 2 (2015)
eng
Copyright (c) 2015 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/5711
2016-05-27T07:18:20Z
IJAA:ART
"160509 2016 eng "
2312-7414
dc
Existence and stability of triangular points in the relativistic R3BP when the bigger primary is a triaxial rigid body and a source of radiation
Singh, Jagadish
Ahmadu Bello UNIVERSITY,zARIA
Nakone, Bello
Usmanu Danfofiyo University,Sokoto
Celestial Mechanics; Radiation; Triaxiality; Relativity; R3BP.
We study the effect of triaxiality and radiation of the bigger primary on the positions and stability of the triangular points in the relativistic R3BP. It is found that the locations of the triangular points are affected by the relativistic terms apart the radiation force and the triaxiality of the bigger primary. It is also seen that for these points, the range of stability region increases or decreases according as without which depends upon the relativistic terms, the radiation and triaxiality coefficient is greater than or less than zero. A practical application of this model could be the study of the motion of a dust grain particle near the Sun-Earth system. A practical application of this model could be the study of the motion of a dust grain particle near the Sun-Earth system.
Science Publishing Corporation
2016-01-13 13:52:23
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/5711
International Journal of Advanced Astronomy; Vol 4, No 1 (2016)
eng
Copyright (c) 2016 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/2765
2014-11-13T03:20:15Z
IJAA:ART
"140614 2014 eng "
2312-7414
dc
Basics of the decelerating black hole universe
UV, Satya Seshavatharam
I-SERVE, Hyderabad, AP, India.
Sr. Engineer, QA-DIP, Lanco Industries Ltd, Tirupati, AP, India.
S, Lakshminarayana
Andhra University, AP, India
Throughout the cosmic evolution, currently believed cosmic critical density can be shown to be a default result of the positively curved light speed rotating black hole universe volume density. As there is no observational or experimental evidence to Friedmanns second assumption, the density classification scheme of Friedmann cosmology must be reviewed at fundamental level and possibly can be relinquished. The observed cosmic redshift can be reinterpreted as an index of cosmological thermodynamic light emission mechanism. Clearly speaking during cosmic evolution, at any time in the past, in hydrogen atom- emitted photon energy was always inversely proportional to the cosmic temperature. Thus past light emitted from older galaxys excited hydrogen atom will show redshift with reference to the current laboratory data. Note that there will be no change in the energy of the emitted photon during its journey from the distant galaxy to the observer. In no way redshift seems to be connected with galaxy receding. By considering the Stoney mass as the initial mass of the baby cosmic black hole, past and current physical and thermal parameters (like angular velocity, growth rate, age, redshift, thermal energy density and matter density) of the cosmic black hole can be understood. For a cosmic temperature of 3000 K, obtained redshift is 1100. From now onwards, CMBR temperature can be called as Comic Black Holes Thermal Radiation temperature and can be expressed as CBHTR temperature. Current cosmic black hole is growing at a rate of 14.66 km/sec in a decelerating mode. Uncertainty relation and all other microscopic physical constants play a crucial role in understanding the halt of the present cosmic expansion. In view of the confirmed zero rate of change in inverse of the Fine structure ratio (from the ground based laboratory experimental results), zero rate of change in the current CMBR temperature (from satellite data) and zero rate of change in the current Hubbles constant (from satellite data), it can be suggested that, current cosmic expansion is almost all saturated and at present there is no significant cosmic acceleration.
Keywords: Machs Principle, Stoney Mass, Black Hole Cosmology, Cosmic Growth Index, Cosmic Growth Rate, Hubble Potential, Cosmic Redshift, Cosmic Age, Halting Of Cosmic Expansion, Final Unification.
Science Publishing Corporation
2014-04-29 11:48:19
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/2765
International Journal of Advanced Astronomy; Vol 2, No 1 (2014)
eng
https://www.sciencepubco.com/index.php/IJAA/article/download/2765/7215
Copyright (c)
oai:ojs.pkp.sfu.ca:article/7279
2017-04-02T06:22:36Z
IJAA:ART
"170225 2017 eng "
2312-7414
dc
On HPM approximation for the perihelion preces-sion angle in general relativity
Shchigolev, Victor
Department of Theoretical Physics, Ulyanovsk State University
Bezbatko, Dmitrii
Department of Theoretical Physics, Ulyanovsk State University
General Relativit; Homotopy Perturbation Method; Perihelion Precession; Kiselev Black Hole.
In this paper, the homotopy perturbation method (HPM) is applied for calculating the perihelion precession angle of planetary orbits in General Relativity. The HPM is quite efficient and is practically well suited for use in many astrophysical and cosmological problems. For our purpose, we applied HPM to the approximate solutions for the orbits in order to calculate the perihelion shift. On the basis of the main idea of HPM, we construct the appropriate homotopy that leads to the problem of solving the set of linear algebraic equations. As a result, we obtain a simple formula for the angle of precession avoiding any restrictions on the smallness of physical parameters. First of all, we consider the simple examples of the Schwarzschild metric and the Reissner - Nordström spacetime of a charged star for which the approximate geodesics solutions are known. Furthermore, the implementation of HPM has allowed us to readily obtain the precession angle for the orbits in the gravitational field of Kiselev black hole.
Science Publishing Corporation
2016-12-09 05:12:26
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/7279
International Journal of Advanced Astronomy; Vol 5, No 1 (2017)
eng
Copyright (c) 2017 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/5025
2015-11-07T04:50:43Z
IJAA:ART
"150802 2015 eng "
2312-7414
dc
An insight on the (Hindu’s) unified quantum cosmology
UV., Satya Seshavatharam
I-SERVE, Hyderabad, AP, India.Sr. Engineer, QA-DIP, Lanco Industries Ltd, Tirupati, AP, India.
S., Lakshminarayana
Andhra university, India
Planck Scale; Modern Cosmology; Hindu Cosmology; Initial Light Speed Expansion; Very Slow Deceleration; Continuous Light Speed Rotation; Cosmic Temperature; Quantum Gravity.
In the heuristic approach, with reference to ‘conservation of energy’, ‘initial light speed expansion’, ‘continuous light speed rotation’, ‘Kerr-Schwarzschild radius’, ‘conservation of centripetal force’, ‘Planck scale’, ‘quantum gravity’ and ‘Hindu model of cosmic age’, we introduce a heuristic ‘model of cosmology’. The authors would like to stress the fact that, ‘with light speed rotation’ qualitatively ‘Hubble parameter’ and ‘angular velocity’ both can be shown to be secondary physical constants and their individual roles can be shown to be similar. With five unified, simplified and workable assumptions, a number of useful cosmological formulae can be generated. With reference to current microwave back ground temperature obtained magnitude of current Hubble parameter is accurately fitting with the recommended value. With the proposed assumptions:1) the intended purpose of ‘lambda’ term can be understood and in future it can be relinquished. 2) Cosmic acceleration and dark energy concepts can be relinquished at fundamental level. 3) Cosmic flatness can be well understood.4) Comic ‘horizon problem’ can be eliminated at fundamental level. In future, either from ‘academic interest’ point of view or from ‘serious research’ point of view, this model can be recommended for in depth analysis at fundamental level.
Science Publishing Corporation
2015-06-13 12:28:06
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/5025
International Journal of Advanced Astronomy; Vol 3, No 2 (2015)
eng
Copyright (c) 2015 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/17241
2019-05-11T07:02:25Z
IJAA:ART
"190505 2019 eng "
2312-7414
dc
Analytical theory in terms of J2, J3, J4 with eccentric anomaly for short-term orbit predictions using uniformly regular KS canonical elements
Anand P, Athira
Department of Aerospace EngineeringKarunya UniversityCoimbatore-641114Tamilnadu, India
Krishan Sharma, Ram
Department of Aerospace Engineering, Karunya Institute of Technology and Sciences, Coimbatore - 641114, Tamil Nadu
Hamilton’s Equations of Motion; Uniformly Regular KS Canonical Elements; Earth’s Oblateness; Short-Term Orbit Predictions; Analytical Integration.
A new non-singular analytical theory with respect to the Earth’s zonal harmonic terms J2, J3, J4 has been developed for short-periodic motion, by analytically integrating the uniformly regular KS canonical equations of motion using generalized eccentric anomaly ‘E’ as the independent variable. Only one of the eight equations need to be integrated analytically to generate the state vector, due to the symmetry in the equations of motion, and the computation for the other equations is done by changing the initial conditions. King-Hele’s expression for radial distance ‘r’ with J2 is also considered in generating the solution. The results obtained from the analytical expressions in a single step during half a revolution match quite well with numerically integrated values. Numerical results also indicate that the solution is reasonably accurate for a wide range of orbital elements during half a revolution and is an improvement over Sharon et al. [17] theory, which is generated in terms of KS regular elements. It can be used for studying the short-term relative motion of two or more space objects and in collision avoidance studies of space objects. It can be also useful for onboard computation in the navigation and guidance packages.
Science Publishing Corporation
2019-05-04 08:29:05
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/17241
International Journal of Advanced Astronomy; Vol 7, No 1 (2019)
eng
Copyright (c) 2019 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/5841
2016-05-27T07:18:19Z
IJAA:ART
"160311 2016 eng "
2312-7414
dc
Quantum gravitational applications of nuclear, atomic and astrophysical phenomena
UV, Satya Seshavatharam
I-SERVE, Hyderabad, AP, India.Sr. Engineer, QA-DIP, Lanco Industries Ltd, Tirupati, AP, India.
S, Lakshminarayana
Andhra university, India
Quantum Gravity; Strong Interaction; Electromagnetic Interaction; Newtonian Gravitational Constant, Schwarzschild Interaction Strength, Neutron Star, Avogadro number and Molar Mass Unit.
By following the old concept of “gravity is having a strong coupling at nuclear scale” and considering the ‘reduced Planck’s constant’ as a characteristic quantum gravitational constant, in this letter we suggest that: 1) There exists a gravitational constant associated with strong interaction, Gs~3.328x1028 m3/kg/sec2. 2) There also exists a gravitational constant associated with electromagnetic interaction, Ge~2.376x1037 m3/kg/sec2.Based on these two assumptions, in a quantum gravitational approach, an attempt is made to understand the basics of final unification with various semi empirical applications like melting points of elementary particles, strong coupling constant, proton-electron mass ratio, proton-neutron stability, nuclear binding energy, neutron star’s mass and radius, Newtonian gravitational constant, Avogadro number and molar mass unit. With further research and investigation, a practical model of ‘quantum gravitational string theory’ can be developed.
Science Publishing Corporation
2016-01-13 13:52:23
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/5841
International Journal of Advanced Astronomy; Vol 4, No 1 (2016)
eng
Copyright (c) 2016 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/30740
2020-07-25T22:53:26Z
IJAA:ART
"200725 2020 eng "
2312-7414
dc
Dark comets: the cosmic catastrophic threat to earth
Khalil, M.
Faculty of Engineering, MSA university, Giza, Egypt
Said, M.
Faculty of Engineering, MSA university, Giza, Egypt
Osman, H.
Faculty of Engineering, MSA university, Giza, Egypt
Younis, N.
Department of English and American studies, University of Vienna, Austria
Khaled, N.
Faculty of Engineering, MSA university, Giza, Egypt
Amr, Y.
Faculty of Engineering, MSA university, Giza, Egypt
A. Mohamed, N.
Faculty of Engineering, MSA university, Giza, Egypt
Ibrahim, A.
Faculty of Engineering, MSA university, Giza, Egypt
Dark Comets; Unseen Interstellar Objects; Comets Detection.
Dark Comets are catastrophic hazardous objects that could hit Earth without warning. There are thousands of such unseen comets buzzing around. Very few of which are known. An overview of the dark comets deadly threat is presented in this paper. Moreover, detection techniques of these invisible objects are discussed.
Science Publishing Corporation
2020-05-15 08:38:40
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/30740
International Journal of Advanced Astronomy; Vol 8, No 1 (2020)
eng
Copyright (c) 2020 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/1043
2015-04-20T03:48:16Z
IJAA:ART
"130623 2013 eng "
2312-7414
dc
Nucleus, Atom and the Universe a combined study
U.V, Satya Seshavatharam
I-SERVE, Alakapuri, Hyderabad-35, AP, India
S, Lakshminarayana
AU, AP, India
B.V.S.T, Sai
Guntur Engg. College, Guntur, AP, India
Now a days many astrophysicists suggest that every galaxy constitutes a central (growing and fast spinning) black hole. Really it is amazing. If the observable universe constitutes so many galaxies then considering universe as a growing and light speed rotating black hole may not be far away from reality. It may be noted that role of dark energy in understanding the unification of fundamental forces is very insignificant. At any given cosmic time, Hubble lengthcan be considered as the gravitational or electromagnetic interaction range. If light is coming from the atomic matter of the galaxy, then the observed redshift can be interpreted as an index of the galactic atomic light emission mechanism. During cosmic evolution, as cosmic time increases, hydrogen atom emit photons with increased quanta of energy and thus past light quanta emitted from an old galaxy will have less energy and show a red shift with reference to our galaxy. During its journey light quanta will not lose energy and there will be no change in the lights wavelength. In this way without any difficulty the accelerating universe concept can be eliminated and a decelerating universe concept can be retained. To understand this light emission mechanism and to move further it is possible to consider the characteristic nuclear radius and characteristic angular momentum of the revolving electron as cosmological time oriented physical variables. Note that, in any bound system, operating force only plays major role in maintaining the existence of the bound system and angular momentum is one of the result. If one is able to make the operating force as discrete, then automatically one can observe a discrete structure like discrete radii, discrete angular momentum and discrete energy levels. With reference to the classical force limit \(\frac{c^4}{G}\) and considering Avogadro number $N$ as a large and discrete proportionality ratio, a characteristic discrete imaginary electroweak force magnitude can be defined as \(\frac{c^4}{G}\)/\(\left(n.N\right)^2\) where n =1,2,3,..
Science Publishing Corporation
2013-06-23 10:02:34
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/1043
International Journal of Advanced Astronomy; Vol 1, No 1 (2013)
eng
Copyright (c)
oai:ojs.pkp.sfu.ca:article/31309
2022-01-02T03:52:52Z
IJAA:ART
"210121 2021 eng "
2312-7414
dc
Quantum model of naturally rotating Machian cosmology and galactic applications of current cosmic angular velocity
V.S. Seshavatharam, U.
I-SERVE, Hyderabad, AP, India.Sr. Engineer, QA-DIP, Lanco Industries Ltd, Tirupati, AP, India.
Lakshminarayana, S.
Andhra University, Visakhapatnam-03,AP
Cosmic Angular Velocity; Galactic Applications; Mach's Universe; Planck Scale.
We would like to emphasize that, extraordinary physical concepts like Big bang, Inflation, Dark energy and Superluminal expansion demand super-normal efforts and need observational support. Observational data is raising day-by-day non-conformity and demanding changes in the original concepts. It is very interesting to note that James Peebles, the famous cosmologist and 2019 Nobel laureate strongly believes that Big bang concept is inappropriate in understanding the universe. It is better to understand and develop models of cosmology based on well supported physical concepts rather than extraordinary physical hypothesis. Unification point of view, quantum cosmology must be given a priority and one should make a note that, Spin is a basic property of quantum physics and rotation is a very common experience. In this context, with reference to life cycle of living creatures and independent of red-shift data, we have developed a quantum model of cosmology associated with Machian universe having Planck scale origin, total dark matter, light speed expansion, light speed rotation, equality of gravitational self energy density and thermal energy density, radially decreasing internal acceleration and radially increasing anisotropy. We are working on understanding and correlating observed redshift data in a unified approach. In this letter, we present various galactic applications of current cosmic angular velocity.
Science Publishing Corporation
2021-01-13 09:09:11
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/31309
International Journal of Advanced Astronomy; Vol 9, No 1 (2021)
eng
https://www.sciencepubco.com/index.php/IJAA/article/download/31309/63889
Copyright (c) 2021 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/7083
2017-04-02T06:22:36Z
IJAA:ART
"170113 2017 eng "
2312-7414
dc
On J2 short-term orbit predictions in terms of KS elements
Saji, Sharon Sara
Department of Aerospace Engineering, Karunya University, Coimbatore - 641114, Tamil Nadu, India
Sellamuthu, Harishkumar
Department of Aerospace Engineering, Karunya University, Coimbatore - 641114, Tamil Nadu, India
Sharma, Ram Krishan
Department of Aerospace Engineering, Karunya University, Coimbatore - 641114, Tamil Nadu, India
Analytical Integration; KS Element Equations; Earth's Oblateness; Short-Term Orbit Prediction; Radial Distance.
Sharma’s singularity-free analytical theory for the short-term orbital motion of satellites in terms of KS elements in closed form in eccentricity with Earth’s zonal harmonic term J2, is improved by using King-Hele’s expression for the radial distance ‘r’ which includes the effect of J2, and is suitable for low eccentricity orbits. Numerical experimentation with four test cases with perigee altitude of 200 km and eccentricity varying from 0.01 to 0.3 for different inclinations is carried out. It is found that the orbital elements computed with the analytical expressions in a single step during half a revolution match very well with numerically integrated values and show significant improvement over the earlier theory. The solution can be effectively used for computation of mean elements for near-Earth orbits, where the short-term orbit perturbations due to J2 play most important role. The theory will be very useful in computing the state vectors during the coast phase of rocket trajectories and flight algorithms for on-board implementation.
Science Publishing Corporation
2016-12-09 05:12:26
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/7083
International Journal of Advanced Astronomy; Vol 5, No 1 (2017)
eng
Copyright (c) 2017 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/4531
2015-04-30T09:23:42Z
IJAA:ART
"150427 2015 eng "
2312-7414
dc
Is the expansion of universe accelerating or the Photons decelerating?
Tank, Hasmukh
Indian Space Research Organization
Cosmology; Cosmological Red-Shift; Accelerated Expansion of the Universe; Steady-State-Cosmology.
Astronomical observations of the cosmological red-shift are currently interpreted in terms of ‘expansion of universe’ and ‘accelerated-expansion of the universe’, at the rate of H0 c; here H0 is Hubble’s constant, and c is the speed of light. Whereas a straight-forward derivation presented here suggests that: rather it is the photon which is decelerating, at the rate of H0 c. Such a deceleration of photons can be caused by virtual electrons, positrons and pi-mesons, contained in the extra galactic quantum vacuum, because: they do have gravitational-acceleration of the same order as H0 c at their “surfaces”; or by decay of a photon into a lighter photon and a particle of mass h H0 / c2. Tired-light interpretations of the cosmological red-shift’ were so far considered as not compatible with the observations of ‘time-dilation of super-novae light-curves’; so in a paper titled: “Wave-theoretical insight into the relativistic ‘length-contraction’ and ‘time-dilation of super-novae light-curves’” (Tank, Hasmukh K. 2013), it has been already shown that any mechanism which can cause ‘cosmological red-shift’ will also cause ‘time-dilation of super-novae light-curves’. Therefore, we now need not to remain confined to the Big-Bang model of cosmology.
Science Publishing Corporation
2015-01-02 05:05:40
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/4531
International Journal of Advanced Astronomy; Vol 3, No 1 (2015)
eng
Copyright (c) 2015 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/9551
2018-06-05T05:49:39Z
IJAA:ART
"180410 2018 eng "
2312-7414
dc
Plane Symmetric Inflationary Universe with Hybrid Expansion Law and Time Varying Λ
Wankhade, Rajesh
Jawaharlal Darda Institute of Engg. & Tech., Yavatmal (M.S)India-445001
Plane Symmetric Universe; Higgs Field; Hybrid Expansion Law.
Plane symmetric inflationary cosmological model using Hybrid Expansion Law (HEL) with flat potential and time varying in General Theory of Relativity has been studied. The solution of the Einstein’s field equations is obtained under the assumption of HEL which yields a time-dependent deceleration parameter presenting transition of the universe from the early decelerating phase to the recent accelerating phase. The physical and kinematical parameters of the models have been studied and discussed.
Science Publishing Corporation
2018-03-12 14:32:08
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/9551
International Journal of Advanced Astronomy; Vol 6, No 1 (2018)
eng
Copyright (c) 2018 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/29648
2019-11-05T02:48:34Z
IJAA:ART
"191002 2019 eng "
2312-7414
dc
Heterogeneous primaries in CR4BP
A. Ansari, Abdullah
ICAIR
Ali, Ashraf
Majmaah University
Shalini, Kumari
University of Delhi
Alam, Mehtab
ICAIR
Equilateral Triangle; Equilibrium Points; Heterogeneous Primaries; R4BP; Stability.
This paper investigates the motion of the massless body moving under the influence of the gravitational forces of the three equal heterogeneous oblate spheroids placed at Lagrangian configuration. After determining the equations of motion and the Jacobian constant of the massless body, we have illustrated the numerical work (Stationary points, zero-velocity curves, regions of motion, Poincare surfaces of section and basins of attraction). And then we have checked the linear stability of the stationary points and found that all the stationary points are unstable.
Science Publishing Corporation
2019-09-03 06:44:23
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/29648
International Journal of Advanced Astronomy; Vol 7, No 2 (2019)
eng
Copyright (c) 2019 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/6536
2016-11-17T12:27:34Z
IJAA:ART
"160917 2016 eng "
2312-7414
dc
Linear stability and resonance of triangular equilibrium points in elliptic restricted three body problem with radiating primary and triaxial secondary
Usha, T.
Narayan, A.
Bhilai Institute of Technology, Durg
Celestial Mechanics; Elliptical Restricted Three Body Problem; Stability; Oblateness; Rigid Body; Resonance.
The present paper studies the linear stability of the triangular equilibrium points of the system. The system comprises of a radiating primary and a triaxial secondary in elliptic restricted three body problem. The existence of third order resonances has been shown and the linear stability has been analyzed for these resonance cases. For the resonance case, and , the conditions of the linear stability are satisfied and the system is stable. But, for the resonance cases and the system is unstable.
Science Publishing Corporation
2016-07-05 19:27:41
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/6536
International Journal of Advanced Astronomy; Vol 4, No 2 (2016)
eng
https://www.sciencepubco.com/index.php/IJAA/article/download/6536/15630
https://www.sciencepubco.com/index.php/IJAA/article/download/6536/15631
Copyright (c) 2016 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/3897
2015-06-04T02:32:20Z
IJAA:ART
"150102 2015 eng "
2312-7414
dc
Non-linear parametric resonance driven oscillations of dumbell satellite in elliptical orbit under the combined effects of magnetic field of the earth and oblateness of the earth
Narayan, A.
Pandey, M. D.
BIT DURG
Evolutional and Non-Evolutional; Perturbing Forces; Stability.
Parametric resonance driven oscillations of a dumbbell satellite in elliptical orbit in central gravitational field of force under the combined effects of perturbing forces Earth Magnetic field and Oblateness of the Earth has been studied. The system comprises of two satellite connected by a light, flexible and inextensible cable, moves like a dumbbell satellite in elliptical orbit, in central gravitational field of force. The gravitational field of the Earth is the main force governing the motion and magnetic field of the Earth and Oblateness of the Earth are considered to be perturbing forces, disturbing in nature. Non-linear oscillations of dumbbell satellite about the equilibrium position in the neighborhood of parametric resonance \(w=1/2\), under the influence of perturbing forces, which is suitable for exploiting the asymptotic methods of Bogoliubov, Krilov and Metropoloskey has been studied, considering ‘e’ to be a small parameter. The Hamiltonian has been constructed for the problem and phase analysis has been applied to investigate the stability of the system.
Science Publishing Corporation
2015-01-02 05:05:40
application/pdf
text/html
https://www.sciencepubco.com/index.php/IJAA/article/view/3897
International Journal of Advanced Astronomy; Vol 3, No 1 (2015)
eng
Copyright (c) 2015 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/8263
2017-10-20T06:55:18Z
IJAA:ART
"170928 2017 eng "
2312-7414
dc
Alternative explanation of some total so-lar eclipse related phenomena
Abunayib, Salah
Project engineer, Sogex Oman Company, Muscat, Sultanate of Oman.
Eclipse; Solar; Totality; Diamond Ring; Shadow Bands; Corona; Photosphere; Chromosphere.
Diamond ring, shadow bands and coronal heating are some phenomena of great interest to concerned scientists and observers during total eclipse of the sun. These phenomena are explained here in a different way which is simply based on the familiar fact that the sun and the moon are actually spherical objects and not just plane disks. Firstly, the diamond of the diamond ring is seen here as two symmetrical seamless joined halves. One-half is the directly seen single spot of the sun that is uncovered by the moon just at the beginning and end of totality. The other half is a mirror image of that spot reflected by the edge surface of the moon. Secondly, the shadow bands phenomenon is explained as due to interference of light from two seamless joined hair crescents. One is the inner edge of the thin crescent sun that can be seen immediately before and after totality. Light from this inner edge hair crescent falling on the edge surface of the moon gets mirror reflected creating another hair crescent image and both are seamlessly embraced by the main crescent sun. Thirdly, during totality when looking at the outer atmosphere of the sun around its eclipsed face, one is actually looking through a very deep transparent atmosphere of the sun. The viewed depth in the outer atmosphere is geometrically hundreds of times greater than that of the photosphere at the center of the face of the sun. Theoretically, the solar energy gets concentrated by the integral effect of all the points along the viewed depth. This may, hence, stand as one of the factors to be considered in explaining the peculiar phenomenon that the temperature increases as we go away from the surface of the sun.
Science Publishing Corporation
2017-07-06 04:38:27
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/8263
International Journal of Advanced Astronomy; Vol 5, No 2 (2017)
eng
Copyright (c) 2017 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/5418
2015-11-08T10:52:22Z
IJAA:ART
"151107 2015 eng "
2312-7414
dc
Applications of light speed expansion and gravitational self-energy density in black hole cosmology
UV, Satya Seshavatharam
I-SERVE, Hyderabad, AP, India.Sr. Engineer, QA-DIP, Lanco Industries Ltd, Tirupati, AP, India.
E, Terry Tatum
Bowling Green, KY
S, Lakshminarayana
Andhra University, India
Black Hole Cosmology; Light Speed Expansion; Gravitational Self Energy Density.
From the beginning of Planck scale to the scale of the current Hubble radius: 1) Considering the relation, subjects of black holes and cosmology, both can be integrated into evolving black hole cosmology and cosmic horizon problem can be relinquished. 2) Considering ‘continuous light speed expansion’ of the cosmic black hole horizon, attributed results of cosmic inflation can be re-addressed completely. If ‘nature’ of the universe is to expand with light speed, then there is no need to think about the existence of currently believed ‘Lambda term’. In addition, ‘light speed expanding cosmic space’ can be called as ‘flat space’. 3) Considering the ratio of gravitational self-energy density and thermal energy density to be (where is the Planck scale temperature, and is cosmic temperature at any time). Quantum gravity can be implemented in low energy scale current cosmological observations. Considering the above concepts, currently believed dark matter energy density and visible matter energy density both can be accurately fitted with the ratio of current gravitational self-energy density and current thermal energy density. To proceed further, the authors would like to highlight the following three points: 1) Deep-space red shift non-linearity can be expected to be connected with cosmological gravitational and relativistic effects and cannot be considered as a major criterion of cosmic evolution. 2) Until one finds solid applications of super luminal speeds and super luminal expansions in other areas of physics like astrophysics and nuclear astrophysics, currently believed ‘cosmic inflation’ cannot be considered as a real physical model and alternative proposals of inflation can be given a chance in exploring the evolving history of the universe. 3) Implementing Planck scale in current paradigm of cosmological observations and standard cosmology is very challenging and is inevitable.
Science Publishing Corporation
2015-06-13 12:28:06
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/5418
International Journal of Advanced Astronomy; Vol 3, No 2 (2015)
eng
Copyright (c) 2015 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/18029
2019-05-11T07:02:25Z
IJAA:ART
"190505 2019 eng "
2312-7414
dc
Big data in astronomy: from evolution to revolution
Khalil, M.
Department of mathematics, Faculty of engineering, Modern sciences and arts University(MSA), Egypt
Said, M.
Department of mathematics, Faculty of engineering, Modern sciences and arts University(MSA), Egypt
Osman, H.
Department of mathematics, Faculty of engineering, Modern sciences and arts University(MSA), Egypt
Ahmed, B.
Department of electrical and computer engineering, Faculty of engineering, University of Victoria, Canada
Ahmed, Dalia
Department of electrical systems engineering, Faculty of engineering, Modern sciences and arts University(MSA), Egypt
Younis, Naheel
Department of English and American studies, University of Vienna, Austria
Maher, B
Department of electrical systems engineering, Faculty of engineering, Modern sciences and arts University(MSA), Egypt
Osama, M.
Department of electrical systems engineering, Faculty of engineering, Modern sciences and arts University(MSA), Egypt
Ashmawy, M.
Department of electrical systems engineering, Faculty of engineering, Modern sciences and arts University(MSA), Egypt
Astronomical Big Data; Computational Mathematics & Statistics; Space Probes & Super Telescopes-Radio Telescopes; Machine Learning-Data Mining.
Big data is pushing astronomy in a new direction. Massive amounts of astronomical big data produced by the new generations of powerful instruments and simulations are exponentially gathered every day. Big data like astronomical images, infrared, microwave, ultraviolet, X-rays and gamma generated by stars, galaxies and black holes are observed by the new generations of space telescopes. It may take years to uncover the hidden signals in such data that may already hold answers to some of the fundamental questions of the universe we’re seeking. In this paper, we attempt to present a short review about the astronomical big data and how can such massive data change our understanding of the universe.
Science Publishing Corporation
2019-05-04 08:29:05
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/18029
International Journal of Advanced Astronomy; Vol 7, No 1 (2019)
eng
Copyright (c) 2019 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/5893
2016-05-27T07:18:20Z
IJAA:ART
"160509 2016 eng "
2312-7414
dc
Existence and linear stability of triangular points in the perturbed relativistic R3BP when the bigger primary is an oblate spheroid
Nakone, Bello
Usmanu Danfofiyo University,Sokoto
Singh, Jagadish
Ahmadu Bello UNIVERSITY,zARIA
Celestial Mechanics; Perturbation; Relativity; Triaxiality; R3BP.
We study the effects of oblateness and small perturbations in the Coriolis and centrifugal forces on the locations and stability of the triangular points in the relativistic R3BP. It is observed that the positions are affected by the oblateness, relativistic, and a small perturbation in the centrifugal force, but are unaffected by that of Coriolis force. It is also seen that the relativistic terms, oblateness, small perturbations in the centrifugal and Coriolis forces influence the critical mass ratio. It is also noticed that all the former three and the latter one possess destabilizing and stabilizing behavior respectively. However, the range of stability increases or decreases according to as p >0 or p<0 where p depends upon the relativistic, oblateness and small perturbations in the Coriolis and centrifugal forces.
Science Publishing Corporation
2016-01-13 13:52:23
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/5893
International Journal of Advanced Astronomy; Vol 4, No 1 (2016)
eng
Copyright (c) 2016 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/2782
2014-12-18T00:33:12Z
IJAA:ART
"140712 2014 eng "
2312-7414
dc
An interpretation of the Hubble expansion by the antigraviton-graviton theory
WONG, Wing-hong
China Evangelical Seminary
WONG, Wing-to
China Evangelical Seminary
WONG, Wing-keung
China Evangelical Seminary
WONG, Ling-mei
China Evangelical Seminary
Building on the foundation of the antigraviton-graviton theory (AGT), which was published recently, in this paper, we shall give a theoretical interpretation of the Hubble expansion of the universe, without adopting the dark matter hypothesis nor the dark energy hypothesis. Our theoretical results may be summarized by two points. Firstly, in contrast to Einsteins general relativity theory (GRT), our AGT predicts that the universe will be expanding, provided that its average density is positive definite. Secondly, our AGT has found that the universe may be divided into two spatial regions. Defining the radius ratio as the ratio of the radius to the radius of the visible universe, it is found that when the radius ratio is less than 0.125, the expansion of the universe can be nearly exactly described by the Hubble formula. When the radius ratio is between 0.125 and 0.64, the expansion rate is greater than that given by the Hubble formula. And the theoretical Hubble expansion rate reaches its maximum when the radius ratio is at about 0.64.
Keywords: Cosmology: Theory, Dark Energy, Dark Matter, Galaxies: Kinematics and Dynamics, Gravitation, Large-Scale Structure of Universe.
Science Publishing Corporation
2014-07-12 20:04:49
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/2782
International Journal of Advanced Astronomy; Vol 2, No 2 (2014)
eng
Copyright (c)
oai:ojs.pkp.sfu.ca:article/7095
2017-04-02T06:22:36Z
IJAA:ART
"170302 2017 eng "
2312-7414
dc
Comparative study of the dynamics of Mimas-Tethys system at different resonances
Jha, Sarita
K. B. Women's College, Vinoba Bhave University
Jha, Goind Kumar
Vinoba Bhave University, Hazaribag,Jharkhand
Secular Resonance; Three-Body Problem; Disturbing Function; Oblateness and Poincare Surface of Section.
Here we have done the comparative study on the dynamics of Mimas-Tethys system at and resonances along with secular resonance of all inner satellites and Saturn’s oblateness. We have drawn Poincare surface of sections and Time-series graph to compare their effect.
Science Publishing Corporation
2016-12-09 05:12:26
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/7095
International Journal of Advanced Astronomy; Vol 5, No 1 (2017)
eng
Copyright (c) 2017 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/4922
2015-11-07T04:50:43Z
IJAA:ART
"150817 2015 eng "
2312-7414
dc
The universe is expanding by entirely moving at some very high speed and not by flying away of the galaxies from each other
Abunaieb, Salah
Kalba Power and Desalination Station, Sharjah Electricity and Water Authority, United Arab Emirates
Expansion; Universe; Galaxies; Nebular Red-Shift; Stars.
Expansion of the universe has already been confirmed by the Hubble discovered nebular red-shift. But, is it expanding in the simple Newtonian way that the distance between any observed distant star and the observer is continuously increasing? The argument against this is: If so, then the apparent brightness and size of that distant star will continuously decrease and thus the stars at the outer edge of the visible universe will disappear in no time. To understand the way in which the universe is expanding it is important, in accordance with the special theory of relativity, to bear in mind the fundamental difference between the way electromagnetic waves spread and the way Newtonian point particles move. Accordingly, the Hubble discovered nebular red-shift is explained here as due to relative motion between the Newtonian point particle observer, which is moving along with the entire universe, and the space-time fixed origins (Events) of the received pulses of light. But, as the source is also moving with the entire universe, these space-time fixed origins are continuously repeated on the continuous world line of the star and hence the recession is continuously repeated while the star remains at the same fixed distance from the observer.
Science Publishing Corporation
2015-06-13 12:28:06
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/4922
International Journal of Advanced Astronomy; Vol 3, No 2 (2015)
eng
Copyright (c) 2015 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/5824
2016-05-27T07:18:19Z
IJAA:ART
"160319 2016 eng "
2312-7414
dc
Mach principle based explanation for the ‘cosmological red-shift’ and it’s evidence
K. Tank, Hasmukh
Cosmology; Astrophysics; Cosmological Red Shift; Pioneer Anomaly.
We first find here that the ratio of: (loss in energy of cosmologically red-shifting photon) and (loss in electrostatic potential-energy of an electron at the same distance D) remains equal to the famous ratio (G me mp) / e2 leading us towards a possibility that ‘cosmological red-shift’ may be due to gravitational effect. Also the ratio h H0 / me c2 = (G me mp) / e2. Starting with Mach’s principle, that ‘mass’ of an object is because of its ‘cosmic gravitational potential energy’, we arrive at a possibility that every moving chunk of matter and energy should experience a fixed value of acceleration H0 c. For the purpose of comparison, we express the ‘cosmological red shift’ as deceleration of the photon, and find that the deceleration experienced by the photon matches perfectly with the expected value. Then it is argued that if such a deceleration is true for a chunk of energy called photon, then it must be true for every particle of matter too. Strikingly, the decelerations experienced by the space-probes Pioneer-10, Pioneer-11, Galileo and Ulysses, as carefully measured by Anderson J.D. ET. Al. Match perfectly with the deceleration of the ‘cosmologically red-shifting photons’; thus providing supportive evidence for the new explanation proposed here.
Science Publishing Corporation
2016-01-13 13:52:23
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/5824
International Journal of Advanced Astronomy; Vol 4, No 1 (2016)
eng
Copyright (c) 2016 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/1061
2014-11-13T03:20:06Z
IJAA:ART
"130706 2013 eng "
2312-7414
dc
Light speed rotating Black Holes: The special holes
UV, Satya Seshavatharam
I-SERVE, Hyderabad, AP, India.
Sr. Engineer, QA-DIP, Lanco Industries Ltd, Tirupati, AP, India.
Astronomers believe that black holes that are as large as a billion solar masses can be found at the centre of most galaxies. Here the fundamental questions to be answered are: If the galactic central black hole mass is 10 billion solar masses and density is less than 1 kg/m3 - with such a small density and large mass, without collapsing - how it is able to hold a gigantic galaxy? What force makes the black hole stable? Recent observations indicates that, instead of collapsing, galactic central black holes are growing faster and spinning faster than they expected. From this it can be suggested that, in the universe black hole geometry is most important than its mass and density. In this regard, considering the classical force and power limits an attempt is made to understand the black hole geometry, radius, angular velocity and temperature. Thinking in this way finally an attempt is made to fit the present Hubbles constant and its obtained value is 66.896 (km/sec)/Mpc. It can be compared with the recently recommended value (67.80+/- 0.77) (km/sec)/Mpc.
Science Publishing Corporation
2013-06-23 10:02:34
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/1061
International Journal of Advanced Astronomy; Vol 1, No 1 (2013)
eng
Copyright (c)
oai:ojs.pkp.sfu.ca:article/31381
2022-01-02T03:52:52Z
IJAA:ART
"210219 2021 eng "
2312-7414
dc
'Oumuamua: A Mysterious Visitor From Deep Space
Khalil, M.
Faculty of Engineering, MSA university, Giza, Egypt
Said, M.
Faculty of Engineering, MSA university, Giza, Egypt
Osman, H.
Faculty of Engineering, MSA university, Giza, Egypt
Younis, N.
Department of English and American studies, University of Vienna, Austria
Khaled, N.
Faculty of Engineering, MSA university, Giza, Egypt
Amr, Y.
Faculty of Engineering, MSA university, Giza, Egypt
A. Mohamed, Nour
Faculty of Engineering, MSA university, Giza, Egypt
Ibrahim, A.
Faculty of Engineering, MSA university, Giza, Egypt
1I/2017 U1; 'Oumuamua; Interstellar Objects; Pan-STARRS1 Telescope.
The mysterious visitor 'Oumuamua is the first interstellar object ever seen in our solar system. It was discovered by the Pan-STARRS tele-scope on 19 October 2017. A short overview of 'Oumuamua is presented in this paper. Moreover, we present this work to spotlight on the fact that, there are trillions of such interstellar objects that could visit our solar system.
Science Publishing Corporation
2021-01-13 09:09:11
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/31381
International Journal of Advanced Astronomy; Vol 9, No 1 (2021)
eng
Copyright (c) 2021 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/7114
2017-04-02T06:22:36Z
IJAA:ART
"170201 2017 eng "
2312-7414
dc
Characteristics exponents of the triangular solution in the elliptical restricted three-body problem under radiating and triaxial primaries
Narayan, Ashutosh
Bhilai Institute of Technology, Durg
Pandey, Krishna Kumar
Shrivastava, Sandip Kumar
ER3BP; Dynamical System Libration Points; Flouqet Theory.
This Paper deals with the effects of the radiation pressure and triaxiality of primaries on the stability of infinitesimal motion about triangular equilibrium points [ , ] in the elliptical restricted three body problem (ER3EB) around binary system. For determining the characteristic exponents of variational equations with periodic coefficient, we have used analytical method, described by Bennet in [3, 4]. This analytical method is based on Floquet’s theory. The stability of equilibrium points has been discussed under the assumption thatboth the primaries are radiating and triaxial. For this we have drawn transition cureves in μ-e plane. And it is seen that system is stable outside the transition curves, while system is Unstable within the transition curves.
Science Publishing Corporation
2016-12-09 05:12:26
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/7114
International Journal of Advanced Astronomy; Vol 5, No 1 (2017)
eng
Copyright (c) 2017 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/4534
2015-05-01T09:24:46Z
IJAA:ART
"150428 2015 eng "
2312-7414
dc
Normalisation of Hamiltonian in photogravitational elliptic restricted three body problem with Poynting-Robertson drag
Mishra, Vivek
B.R.A.Bihar University,Muzaffarpur
Ishwar, Bhola
B.R.A.Bihar University,Muzaffarpur
First-Order Normalization/ERTBP/Photogravitational/P-R Drag.
In this paper, we have performed first order normalization in the photogravitational elliptic restricted three body problem with Poynting-Robertson drag. We suppose that bigger primary as radiating and smaller primary is an oblate spheroid. We have found the Lagrangian and the Hamiltonian of the problem. Then, we have expanded the Lagrangian function in power series of x and y, where (x, y) are the coordinates of the triangular equilibrium points. Using Whittaker (1965) method, we have found that the second order part H2 of the Hamiltonian is transformed into the normal form.
Science Publishing Corporation
2015-01-02 05:05:40
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/4534
International Journal of Advanced Astronomy; Vol 3, No 1 (2015)
eng
Copyright (c) 2015 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/9641
2018-06-05T05:49:39Z
IJAA:ART
"180430 2018 eng "
2312-7414
dc
Location of triangular equilibrium points in the perturbed CR3BP with laser radiation pressure and oblateness
Khalifa, Nabawia
1 Department of Basic Science, Deanship of Preparatory Year, University of Hail, Hail, KSA2 Sun and Space researches lab, National Institute of Astronomy and Geophysics (NRIAG), Helwan Egypt.
Perturbed CR3BP- Laser Radiation Pressure-Triangular Points.
This paper represents a semi-analytical study of the effect of ground-based laser radiation pressure on the location of triangular points in the framework of the planar circular restricted three-body problem (CR3BP). The formulation includes both the effects of oblateness of J2 in addition to laser radiation pressure, where laser’s disturbing function expanded in Legendre polynomials up to the first order. Earth-Moon system is considered in which a laser station is located on Earth and sends laser beams toward the infinitesimal body. The model takes into account the effect of Earth's atmosphere on laser beam propagation. The numerical application emphasis that the location of the triangular points affected by the considered perturbations.
Science Publishing Corporation
2018-03-12 14:32:08
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/9641
International Journal of Advanced Astronomy; Vol 6, No 1 (2018)
eng
Copyright (c) 2018 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/29814
2019-11-05T02:52:58Z
IJAA:ART
"191105 2019 eng "
2312-7414
dc
Location and stability of the triangular Lagrange points in photo-gravitational elliptic restricted three body problem with the more massive primary as an oblate spheroid
Arantza Jency, A.
Department of Aerospace EngineeringKarunya UniversityCoimbatore-641114Tamilnadu, India
Krishan Sharma, Ram
Mean Motion; Planar ERTBP; Oblateness; Radiation Pressure; Critical Mass Ratio; Triangular Lagrangian Points; Transition Curves.
The triangular Lagrangian points of the elliptic restricted three-body problem (ERTBP) with oblate and radiating more massive primary are studied. The mean motion equation used here is different from the ones employed in many studies on the perturbed ERTBP. The effect of oblateness on the mean motion equation varies. This change influences the location and stability of the triangular Lagrangian points. The points tend to shift in the y-direction. The influence of the oblateness on the critical mass ratio is also altered. But the eccentricity limit for stability remains the same.
Science Publishing Corporation
2019-09-03 06:44:23
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/29814
International Journal of Advanced Astronomy; Vol 7, No 2 (2019)
eng
Copyright (c) 2019 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/30976
2020-11-10T12:27:38Z
IJAA:ART
"200902 2020 eng "
2312-7414
dc
Is Newtonian gravitational constant a quantized constant of microscopic quantum gravity?
Seshavatharam, UVS
I-SERVE, Hyderabad, AP, India.Sr. Engineer, QA-DIP, Lanco Industries Ltd, Tirupati, AP, India.
Lakshminarayana, S
Dept. of Nuclear Physics, Andhra University, Visakhapatnam-03,AP, India
Three Atomic Gravitational Constants; Newtonian Gravitational Constant; Quantum Gravity.
Considering the Newtonian gravitational constant as a quantized constant of microscopic quantum gravity, an attempt is made to fit its value in a verifiable approach with reference to three large atomic gravitational constants pertaining to weak, strong and electromagnetic interactions linked with a quantum relation. Estimated value seems to be 865 ppm higher than the recommended value.
Science Publishing Corporation
2020-08-31 14:01:59
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/30976
International Journal of Advanced Astronomy; Vol 8, No 2 (2020)
eng
Copyright (c) 2020 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/6582
2016-11-17T12:27:34Z
IJAA:ART
"160920 2016 eng "
2312-7414
dc
Is dark energy – an alias of cosmic rotational kinetic energy?
UV, Satya Seshavatharam
I-SERVE, Hyderabad, AP, India.Sr. Engineer, QA-DIP, Lanco Industries Ltd, Tirupati, AP, India.
S, Lakshminarayana
Andhra university, India
Planck Scale; Mach’s Principle; Dark Energy; Rotational Kinetic Energy; Cosmic Age; Cosmic Scale Factor.
Considering Planck scale and Mach’s principle, theoretically it is possible to show that magnitude of the currently believed dark energy is equal to the magnitude of current cosmic rotational kinetic energy.
Science Publishing Corporation
2016-07-05 19:27:41
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/6582
International Journal of Advanced Astronomy; Vol 4, No 2 (2016)
eng
Copyright (c) 2016 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/4074
2015-06-04T02:05:32Z
IJAA:ART
"150204 2015 eng "
2312-7414
dc
Characteristics exponents of the triangular solution in the elliptical restricted three body problem under the radiation and oblateness of primaries
Narayan, Ashutosh
Bhilai Institute of Technology, Durg
Shrivastava, Amit
Ishwar, B.
Elliptical Restricted Three Body Problem; Stability; Radiation; Oblateness; Binary System.
This paper studies effects of the oblateness and radiation of both the primaries on the stability of the infinitesimal motion about triangular equilibrium points (L4,5) in the elliptical restricted three body problem (ER3BP) around the binary system We have exploited analytical method for determining of characteristics exponent to the variational equations with periodic coefficients, developed by Bennet (! 965b), which is based on the Floquet's theory. The stability of the infinitesimal motion about the triangular points under the effects of radiation and oblateness of both the primaries around the binary systems Achird, Luyten726-8, Kruger 60, Alpha Centauri AB and Xi Bootis, has been studied. The stability of infinitesimal around the triangular points has been studied based on the analytical and numerical exploration is simulated by drawing transition curves bounding the region of stability in the (μ-e) plane. The region of stability changed with variations in eccentricity, oblateness and radiation pressures. It is observed that the equilibrium points stable in the shaded portion of the transition curve, whereas unstable outside the region of the transition curves.
Science Publishing Corporation
2015-01-02 05:05:40
application/pdf
text/html
https://www.sciencepubco.com/index.php/IJAA/article/view/4074
International Journal of Advanced Astronomy; Vol 3, No 1 (2015)
eng
Copyright (c) 2015 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/8329
2017-10-20T06:55:18Z
IJAA:ART
"171005 2017 eng "
2312-7414
dc
Estimation of direct normal irradiance under various sky condi-tions in data sparse tropical ecological zones in Nigeria
Nwokolo, Samuel
University of Calabar
Ogbulezie, Julie
University of Calabar
Decomposition Model; Equatorial Line; Direct Transmittance; Clearness Index; Extraterrestrial Solar Radiation.
In this study, models for estimating direct normal irradiance (Hb) under various sky conditions in data sparse tropical ecological zones in Nigeria were fitted. The evaluated values of clearness index indicate that the prevailing sky condition in the southern tropical zones is heavily overcast while the northern zones experience partly overcast under all sky conditions. From the analyses of the influences of clearness index on Hb, it was observed that higher values of Hb were recorded in the far north zone of Sahel savannah (FNZSS) of Sokoto while lower values were registered in the far south zone of mangrove swamp of Port Harcourt revealing an increasing trend from FSZMS to FNZSS due to the trends in cloudiness and associated atmospheric moisture with the movement through the Hadley cell calculation system along the equatorial line. The regression correlation models developed from the model performance test indicates that the proposed models could be used to estimate Hb accurately between latitude 4 to 10oN, that is, mangroves swamp and Guinea savannah tropical zones in Nigeria and other locations with comparable sky conditions.
Science Publishing Corporation
2017-07-06 04:38:27
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/8329
International Journal of Advanced Astronomy; Vol 5, No 2 (2017)
eng
Copyright (c) 2017 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/5587
2016-05-27T07:18:19Z
IJAA:ART
"160113 2016 eng "
2312-7414
dc
A general solution to non-collinear equilibria in terms of largest root (κ) of confocal oblate spheroid
Idrisi, M Javed
School of Physical and Molecular SciencesDepartment of MathematicsAl-Falah UniversityFaridabad (Haryana) - 121004
Celestial Mechanics; Restricted Three-Body Problem; Libration Points; Oblate Spheroid; Confocal Oblate Spheroid.
This paper deals with the existence of non-collinear equilibria in restricted three-body problem when less massive primary is an oblate spheroid and the potential of oblate spheroid is in terms of largest root of confocal oblate spheroid. This is found that the non-collinear equilibria are the solution of the equations r1 = n-2/3 and κ = 1 – a2, where r1 is the distance of the infinitesimal mass from more massive primary, n is mean-motion of primaries, a is semi axis of oblate spheroid and κ is the largest root of the equation of confocal oblate spheroid passes through the infinitesimal mass.
Science Publishing Corporation
2016-01-13 13:52:23
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/5587
International Journal of Advanced Astronomy; Vol 4, No 1 (2016)
eng
Copyright (c) 2016 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/20599
2019-05-11T07:02:25Z
IJAA:ART
"190505 2019 eng "
2312-7414
dc
Theory of gateway in case of time travel
Ahamed, Sahriar
No affiliation. Individual researcher
Time; Space; Relativity; Albert Einstein; Light; Speed of Rays; Gate Way; Travel Time; String Theory.
When we record any video, where do we keep and store it? In a space- that we call memory card or disk or any other kind of storage device. When we are required to see our memories, what we do? We play it with a video player software which is known as media player, dvd player or video player etc. These video player software works as the gate way to visualize the past in-front of us. Same way our reality is storing in another place/space which is another dimension that we know as our past. We can always see it by creating a gate way same as video player software or we may say it as knowledge.
Science Publishing Corporation
2019-05-04 08:29:05
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/20599
International Journal of Advanced Astronomy; Vol 7, No 1 (2019)
eng
Copyright (c) 2019 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/6105
2016-05-27T07:18:20Z
IJAA:ART
"160522 2016 eng "
2312-7414
dc
Matter exhibiting absolute rest and the origin of the solar system
Robertson, Daniel
None
Absolute Zero; Absolute Rest.
The development of a volume of space containing matter which exhibits no movement of any kind is described. This is identified as matter in a state of Absolute Rest as envisaged by Newton. The proper-ties of matter in this state are described. The induction of the change from motion to rest and the re-verse are detailed and the latter applied to the origin of the Sun and the development of the Solar Sys-tem.
Science Publishing Corporation
2016-01-13 13:52:23
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/6105
International Journal of Advanced Astronomy; Vol 4, No 1 (2016)
eng
Copyright (c) 2016 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/3088
2014-12-18T00:33:12Z
IJAA:ART
"140813 2014 eng "
2312-7414
dc
WONG, Wing-hong
China Evangelical Seminary
WONG, Wing-to
China Evangelical Seminary
WONG, Wing-keung
China Evangelical Seminary
WONG, Ling-mei
China Evangelical Seminary
On one hand, the Wongs antigraviton-graviton theory (AGT), which may also be called a new quantum gravity theory, predicts that at the limit of infinite radius, the effective acceleration is proportional to the square root of the Newtonian gravitational acceleration. Thus it partially supports Milgroms fitting formula (MIFF). On the other hand, our AGT discovers that the definition of the critical acceleration as a universal parameter by MIFF is not adequately valid.
Keywords: Cosmology: Theory, Dark Matter, Galaxies: Kinematics And Dynamics, Gravitation, Large-Scale Structure Of Universe.
Science Publishing Corporation
2014-07-12 20:04:49
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/3088
International Journal of Advanced Astronomy; Vol 2, No 2 (2014)
eng
Copyright (c)
oai:ojs.pkp.sfu.ca:article/7104
2017-04-02T06:22:36Z
IJAA:ART
"170319 2017 eng "
2312-7414
dc
Analysis on nonlinear stability of the triangular libration points for radiating and oblate primaries in ER3BP
Singh, Nutan
Bhilai Institute of Technology, Durg
Narayan, A.
Er3bp; Hamiltonian Functions; Triangular Libration Points; Resonance;Kam Theory.
In this paper we study the non linear stability of the triangular librations points in ER3BP considering both the primaries as radiating and oblate. The study is carried out near the resonance frequency satisfying the conditions in resonance as well as non resonance case. The study is conducted for various values of radiation pressure and oblateness parameters. It is observed that the case corresponds to the boundary region of the stability for the system Further, it is examined that the system experiences resonance at for different values of radiation pressures and oblateness parameter. In non resonance case, it is observed that the equilibrium points are stable. In resonance case, for and the triangular equilibrium points are unstable. In case, when for some values of radiation pressure and oblateness parameter, it is stable and for some it is unstable. The model is best suited to the binary systems (Achird, Luyten, α Cen AB, Kruger- 60, Xi- Bootis).
Science Publishing Corporation
2016-12-09 05:12:26
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/7104
International Journal of Advanced Astronomy; Vol 5, No 1 (2017)
eng
Copyright (c) 2017 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/5313
2015-11-07T04:50:43Z
IJAA:ART
"151009 2015 eng "
2312-7414
dc
Effect of elliptic angle φ on the existence and stability of libration points in restricted three-body problem in earth-moon system considering earth as an ellipsoid
Idrisi, M Javed
School of Physical and Molecular SciencesDepartment of MathematicsAl-Falah UniversityFaridabad (Haryana) - 121004
Amjad, Muhammad
School of Physical and Molecular SciencesDepartment of MathematicsAl-Falah UniversityFaridabad (Haryana) - 121004
Restricted Three-Body Problem; Libration Points; Linear Stability; Elliptic Integrals; Newton-Raphson Method.
This paper deals with the existence and the stability of the earth-moon libration points in the restricted three-body problem. In this paper we have considered the bigger primary as an ellipsoid while the smaller one as a point-mass. This is observed that the collinear and non-collinear libration points exist only in the interval 0˚<φ < 45˚. There exist three collinear libration points and the non-collinear libration points are forming a right triangle with the primaries. Further observed that the libration points either collinear or non-collinear all are unstable in 0˚<φ < 45˚.
Science Publishing Corporation
2015-06-13 12:28:06
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/5313
International Journal of Advanced Astronomy; Vol 3, No 2 (2015)
eng
Copyright (c) 2015 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/5874
2016-05-27T07:18:19Z
IJAA:ART
"160321 2016 eng "
2312-7414
dc
Origin of dark mass apparentfrom gravitationally bound extended ordinary material systems
Biswas, Shubhen
G.P.S.H.SchoolAlaipur, Nadia, Pin-741245(W.B.), India
To grow up a gravitationally bound system with fixed proper mass requires sufficient energy to overcome the gravitational pull. Following General relativity both matter energy and field energy act on the source of gravity. Apart from the field energy if o
To grow up a gravitationally bound system with fixed proper mass requires sufficient energy to overcome the gravitational pull. Following General relativity both matter energy and field energy act on the source of gravity. Apart from the field energy if our concern is just for the bound system of mass only, then we can easily attribute the gain of matter energy as the gain of gravitational mass. This gain of matter energy can be backed immediately if the system is allowed to collapse to its initial state. So in the case of expansion there will be no possibility in creation of normal or proper mass. But the concern regarding the gain of matter energy must have realistic effect in increase of gravitational mass. This article explains how gravitational mass of the gravitationally bound large material system like galaxy exceeds its ordinary mass with the size of the system. Here presence of the dark mass and flat rotation curve are given without considering MOND theory, not even distorting any accepted paradigm of post Newtonian gravity. The findings are truly consistent with the recent observed data.
Science Publishing Corporation
2016-01-13 13:52:23
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/5874
International Journal of Advanced Astronomy; Vol 4, No 1 (2016)
eng
Copyright (c) 2016 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/1149
2014-11-13T03:20:08Z
IJAA:ART
"130805 2013 eng "
2312-7414
dc
To confirm the existence of Black hole cosmology
UV, Satya Seshavatharam
I-SERVE, Hyderabad, AP, India.
Sr. Engineer, QA-DIP, Lanco Industries Ltd, Tirupati, AP, India.
S, Lakshminarayana
Andhra University, AP, India
It may be noted that, increased redshifts and increased distances forced Edwin Hubble to propose the Hubbles law.In fact there is no chance or scope or place for 'galaxy receding'. If it is possible to show that, (from the observer) older galaxys distance increases with its age, then automatically the concepts galaxy receding and accelerating universe can be put for a revision at fundamental level. Its only our belief in its 'given'(Doppler shift based) unproven cosmological interpretation. Even then, merely by estimating galaxy distance and without measuring galaxy receding speed, one cannot verify its acceleration. Clearly speaking: two mistakes are happening here. 1) Assumed galaxy receding speed is not being measured and not being confirmed. 2) Without measuring and confirming the galaxy receding speed, how can one say and confirm that it (galaxy) is accelerating. It is really speculative and unfortunate also. During cosmic expansion, assuming past and present galaxies (which actually found to have gigantic structures) as points and guessing photons coming from that galactic point particles seem to be ad-hoc. If light is coming from the atomic matter of the gigantic galaxy, then cosmic redshift can be interpreted as an index of the galactic atomic light emission mechanism. In no way it seems to be connected with galaxy receding. Whatever may be the expression, definitions of cosmic red shift seem to be ad-hoc and not absolute. Hence with redshift concept - one may not be able to understand the actual rate of cosmic expansion and actual cosmic geometry. Some cosmologists use the term Hubble volume to refer to the volume of theobservable universe. At any given time, the product of critical density and Hubble volume gives a characteristic cosmic mass and it can be called as the Hubble mass. Interesting thing is that, Schwarzschild radius of the Hubble mass again matches with the Hubble length. Most of the cosmologists believe that this is merely a coincidence. If one is able to show its applications in different areas of fundamental physics, certainly it can be given more significance and superiority compared to the mysterious dark energy. At any given cosmic time, Hubble length can be considered as the gravitational or electromagnetic interaction range. Hubble volume and Hubble mass play a crucial role in quantum physics, nuclear physics, atomic physics and particle physics. If universe constitutes so many galaxies, if each galaxy constitutes a central fast growing and (light speed) spinning black hole and if black hole geometry is more intrinsic than its mass and mass density, then considering universe as a growing and light speed rotating black hole may not be far away from reality. Unknowingly the fundamental physical laws are being developed, being executed and being proven inside and under the background of a growing and light speed rotating black hole universe. It can be suggested that, quantum of angular momentum may be due to the cosmological manifestation and discrete nature of angular momentum may be due the discrete nuclear matter. In any bound system, operating force only plays major role in maintaining the existence of the bound system and angular momentum is one of the result. If one is able to make the operating force as discrete, then automatically one can observe a discrete structure like discrete radii, discrete angular momentum and discrete energy levels. Alternatively if atomic nucleus constitutes any fixed number of protons and any fixed number of neutrons, it is possible to guess that- nuclear mass is discrete. If nuclear matter is discrete, it is also possible to have a discrete atomic structure . In this new direction authors noticed some interesting and very strange coincidences. Main problem is that, the new relations are very simple to understand and very difficult to confirm. The most important point to be noted here is that, synthesis of elementary physical constants seem to be more fundamental than the cosmological nucleosynthesis.
Science Publishing Corporation
2013-08-05 20:17:14
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/1149
International Journal of Advanced Astronomy; Vol 1, No 2 (2013)
eng
https://www.sciencepubco.com/index.php/IJAA/article/download/1149/3768
Copyright (c)
oai:ojs.pkp.sfu.ca:article/31466
2022-01-02T03:52:52Z
IJAA:ART
"210328 2021 eng "
2312-7414
dc
Tracking Comets and Asteroids Using Machine Learning and Deep Learning: A Review
Khalil, M.
Faculty of Engineering, MSA university, Giza, Egypt
Said, M.
Faculty of Engineering, MSA university, Giza, Egypt
Ibrahim, A.
Faculty of Engineering, MSA university, Giza, Egypt
Gamal, M.
Faculty of Engineering, MSA university, Giza, Egypt
A. Mobarak, M.
Machine Learning; Deep Learning; Tracking of Comets and Asteroids; Long Period Comets.
Comets and asteroids are considered as very dangerous objects to Earth. Machine Learning and Deep Learning tools can be used to identify and track such hazardous objects early enough prior to impact. Preparation strategies require several years, so the early detection of such hazardous objects is very crucial aspect. In this paper, the importance of using Machine Learning and Deep Learning to identify and detect asteroids and comets is discussed briefly.
Science Publishing Corporation
2021-01-13 09:09:11
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/31466
International Journal of Advanced Astronomy; Vol 9, No 1 (2021)
eng
Copyright (c) 2021 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/7180
2018-04-10T05:38:12Z
IJAA:ART
"170208 2017 eng "
2312-7414
dc
Inflation, dark energy, and dark matter
Kalita, Ranku
Independent Researcher
Cosmology; Cosmological Constant; Dark Energy; Dark Matter; Inflation.
Inflation leads to Ω = 1 for the big bang universe, and which is indeed observed. However, the presence of two mysterious constituents in the big bang universe – dark energy and dark matter – also produces Ω = 1. This paper utilizes propositions about the nature of dark energy and dark matter to trace their origins to the contents of the inflationary universe.
Science Publishing Corporation
2016-12-09 05:12:26
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/7180
International Journal of Advanced Astronomy; Vol 5, No 1 (2017)
eng
Copyright (c) 2017 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/4652
2015-11-07T04:50:43Z
IJAA:ART
"150613 2015 eng "
2312-7414
dc
First order normalization in the generalized photo gravitational non-planar restricted three body problems
Sinha, Nirbhay Kumar
DELHI UNIVERSITY
Normalisation; Photogravitational; Non-Planar; RTBP.
In this paper, we normalised the second-order part of the Hamiltonian of the problem. The problem is generalised in the sense that fewer massive primary is supposed to be an oblate spheroid. By photogravitational we mean that both primaries are radiating. With the help of Mathematica, H2 is normalised to H2 = a1b1w1 + a2b2w2. The resulting motion is composed of elliptic motion with a short period (2p/w1), completed by an oscillation along the z-axis with a short period (2p/w2).
Science Publishing Corporation
2015-06-13 12:28:06
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/4652
International Journal of Advanced Astronomy; Vol 3, No 2 (2015)
eng
Copyright (c) 2015 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/9786
2018-06-05T05:49:39Z
IJAA:ART
"180430 2018 eng "
2312-7414
dc
Laser orbital perturbations in Hamiltonian framework
El-Saftawy, M. I
King Abdul-Aziz University, Faculty of Science, Department of Astronomical Science, Jeddah, K.S.A , Sun and Space researches lab, National Institute of Astronomy and Geophysics (NRIAG), Helwan Egypt.
Khalifa, Nabawia
Department of Basic Science, Deanship of Preparatory Year, University of Hail, Hail, KSA, Sun and Space researches lab, National Institute of Astronomy and Geophysics (NRIAG), Helwan Egypt.
Canonical Formulation; Laser Radiation Pressure and Orbital Perturbations.
The effect of laser photon pressure on the spacecraft’s orbit is modeled. The force model developed taking into consideration atmospheric beam attenuation. However, adaptive optics assumed fixed on the laser system in order to eliminate the effect of atmospheric turbulence. The force of a single laser pulse proved as a conservative force. Consequently, its potential obtained using Legender polynomial. Assuming a spherical Earth, the Hamiltonian of the problem developed in terms of Dalaunay elements up to the first zonal harmonic. Using different ground-based laser systems, the model applied to the satellite Ajisai of NORAD ID 16908 and the LEO debris ASTRO-F DEB of NORD ID 29054. The numerical results emphasized that laser pressure has an effect on the orbit and it is well agreed with the results of the Newtonian treatment of the problem.
Science Publishing Corporation
2018-03-12 14:32:08
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/9786
International Journal of Advanced Astronomy; Vol 6, No 1 (2018)
eng
Copyright (c) 2018 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/5680
2016-05-27T07:18:19Z
IJAA:ART
"160123 2016 eng "
2312-7414
dc
Fractional action cosmology with an effective \(\wedge\) -term
Shchigolev, Victor
Department of Theoretical Physics, Ulyanovsk State University
Cosmological Models; Effective Cosmological Term; Exact Solutions; Fractional Einstein-Hilbert Action.
We continue studying the cosmological models derived from the fractional variational principle applied to the gravitational sector of the action functional. Within the frame of these models, the effective cosmological term could arise as a result of the non-zero Hubble parameter. At the same time, the continuity equation for the matter remains unchanged in its standard form. In this work, we are going to obtain some exact solutions for our model originating from the several kinematic assumptions. At that, we find the main cosmography parameters of the model and the corresponding equations of state of matter that fills the universe se. First, we proceed from an initially given law of evolution of the universe in some standard scenarios. Then, several exact solutions are obtained from the proposed earlier evolutionary laws for the effective cosmological term.
Science Publishing Corporation
2016-01-13 13:52:23
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/5680
International Journal of Advanced Astronomy; Vol 4, No 1 (2016)
eng
Copyright (c) 2016 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/30232
2020-07-25T22:50:02Z
IJAA:ART
"200515 2020 eng "
2312-7414
dc
SCINDA-GPS derived TEC depletions and amplitude scintillations over Kisumu, Kenya during selected quiet and storm days of 2013 and 2014
Edward, Uluma
Masinde Muliro university of science and technology
Boniface, Ndinya
Masinde Muliro University of science and technology
George, Omondi
Maseno University
Amplitude Scintillation; Geomagnetic Meridian; Solar Cycle 24; Solar Intensity; TEC Depletion.
Total Electron Content (TEC) depletion and amplitude scintillation (S4) can be derived from, SCINDA-GPS receivers situated in various parts of the equatorial region. In this paper we present results of characterization of TEC depletions and amplitude scintillations over Kisumu, Kenya (Geomagnetic coordinates: 9.64o S, 108.59o E; Geographic coordinates: 0.02o S, 34.6o E) for both selected geomagnetically quiet and geomagnetically disturbed conditions between 1st January 2013 and 31st December 2014 using data derived from the Kisumu NovAtel GSV4004B SCINDA-GPS receiver situated at Maseno University. TEC depletions and amplitude scintillations affect Global Positioning System (GPS) signals in the ionosphere as they propagate from the satellite to the receiver. This study aims to investigate day to day variability of TEC depletions and amplitude scintillations over Kisumu, Kenya during both geomagnetically quiet and geomagnetically disturbed days of 2013 and 2014 which was a high solar activity period for Solar Cycle 24. Seasonal variability of TEC depletions and S4 index is also presented. The Receiver Independent Exchange (RINEX) data for the years 2013 and 2014 was retrieved from the Kisumu SCINDA-GPS receiver, processed to obtain Vertical Total Electron Content (VTEC), S4 and Universal Time (UT) and fed into MATLAB to generate VTEC and S4 plots against UT for each selected quiet and storm day within the 2013 and 2014 period. The obtained results showed a diurnal variation of TEC where TEC was minimum at pre-sunrise, maximum during daytime and minimum during nighttime. The minimum TEC during pre-sunrise and nighttime was attributed to reduced solar intensity while maximum TEC during daytime is attributed to increased solar intensity. Most of the selected quiet and storm days of the years 2013 and 2014 showed TEC depletions and TEC enhancements corresponding with enhanced amplitude scintillations between 1800UT and 20:00UT. This might be attributed to the rapid rise of the F-layer and the increase in the vertical E x B plasma drift due to the Pre-reversal Enhancement (PRE) of the eastward electric field. Post-midnight TEC depletions and amplitude scintillations were observed for some days and this was attributed to the effect of zonal winds which brought post-midnight enhancement of the E x B drift. The percentage occurrence of amplitude scintillations for the selected quiet and storm days exhibited a seasonal dependence with equinoctial months having higher occurrences than the solstitial months. The higher average S4 index during equinoctial months might be attributed to increased solar intensity resulting from the close alignment of the solar terminator and the geomagnetic meridian.
Science Publishing Corporation
2020-05-15 08:38:40
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/30232
International Journal of Advanced Astronomy; Vol 8, No 1 (2020)
eng
Copyright (c) 2020 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/31149
2020-11-10T12:30:53Z
IJAA:ART
"201110 2020 eng "
2312-7414
dc
The Dazzling Comet C/2020 F3 (NEOWISE): The Comet of The Century
Khalil, M.
Faculty of Engineering, MSA university, Giza, Egypt
Said, M.
Faculty of Engineering, MSA university, Giza, Egypt
Osman, H.
Faculty of Engineering, MSA university, Giza, Egypt
Younis, N.
Department of English and American studies, University of Vienna, Austria
Khaled, N.
Faculty of Engineering, MSA university, Giza, Egypt
Amr, Y.
Faculty of Engineering, MSA university, Giza, Egypt
A. Mohamed, N.
Faculty of Engineering, MSA university, Giza, Egypt
brahim, A.
Faculty of Engineering, MSA university, Giza, Egypt
NEOWISE (C/2020 F3) Comet; Bright Comets; Comet of the Century.
The newfound long period comet NEOWISE has the potential to be one of the brightest comets ever seen. The comet which was visible to the naked eye is considered as the comet of the century. This icy object was discovered on March 27, 2020. In this paper, we dive into some fascinating facts about NEOWISE comet that make such comet unique.
Science Publishing Corporation
2020-08-31 14:01:59
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/31149
International Journal of Advanced Astronomy; Vol 8, No 2 (2020)
eng
Copyright (c) 2020 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/6523
2016-11-17T12:27:34Z
IJAA:ART
"160924 2016 eng "
2312-7414
dc
Existence and stability of collinear points in elliptic restricted three body problem with radiating and oblate primaries
Chakraborty, Anindita
Bhilai Institute of Technology
Narayan, Ashutosh
Bhilai Institute of Technology
Shrivastav, Amit
Rungta College of Engineering and Technology
ERTBP; Collinear Points; Generalized Photogravitational System;Oblateness; Linear Stability.
The location of the collinear points in elliptical restricted three body problem, taking into account the effect of oblateness and radiation pressure of both primaries, has been obtained in this paper. Vinti's method has been exploited and the x-coordinates are obtained in the form of series solution. The linear stability has been investigated and it is found that the points are unstable in the Lyapunov's sense. The problem is also numerically explored taking into account two binary systems: Luyten-726 and Kruger-60.
Science Publishing Corporation
2016-07-05 19:27:41
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/6523
International Journal of Advanced Astronomy; Vol 4, No 2 (2016)
eng
Copyright (c) 2016 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/3788
2015-06-04T02:56:01Z
IJAA:ART
"150221 2015 eng "
2312-7414
dc
On fixing the magnitudes of gravitational constant and strong coupling constant
UV, Satya Seshavatharam
I-SERVE, Hyderabad, AP, India.Sr. Engineer, QA-DIP, Lanco Industries Ltd, Tirupati, AP, India.
S, Lakshminarayana
Andhra university, India
Gravitational constant; Schwarzschild’s interaction; Astrophysical force limit; Avogadro number; Particle rest masses; Strong interaction; nuclear binding energy; and Electron’s (n2) quantum states.
In the earlier published papers the authors suggested that, “Magnitude of the unified force can be assumed to be equal to the classical or astrophysical force limit . Strength of any interaction can be defined as the ratio of the operating force magnitude and the magnitude of . If strength of the Schwarzschild interaction is assumed to be unity, then weak interaction strength seems to be ‘squared Avogadro number’ times less than the Schwarzschild interaction. The characteristic atomic force can be represented by ”. Thinking in this way, atomic gravitational constant can be expressed as With current atomic physical constants and with the assumed two new grand unified back ground numbers analytically - value of can be fixed for 10 digits and can be verified. Inverse of the strong coupling constant can be considered as the ‘natural logarithm of square root of ratio of gravitational and electromagnetic force ratio of down quark mass where the operating gravitational constant is squared Avogadro number times the gravitational constant’. Finally an attempt is made to fit and understand the mystery of Up and Down quarks, nuclear stability, and nuclear binding energy. For medium and heavy atomic nuclides, at the stable mass number, nuclear binding energy seems to be equal to the sum of rest energy of up quarks and down quarks.
Science Publishing Corporation
2015-01-02 05:05:40
application/pdf
text/html
https://www.sciencepubco.com/index.php/IJAA/article/view/3788
International Journal of Advanced Astronomy; Vol 3, No 1 (2015)
eng
Copyright (c) 2015 International Journal of Advanced Astronomy
oai:ojs.pkp.sfu.ca:article/8308
2017-10-20T06:55:18Z
IJAA:ART
"171005 2017 eng "
2312-7414
dc
Performance evaluation of existing sunshine-based computing models for estimating global solar radiation at Lagos, Nigeria
Nwokolo, Samuel
University of Calabar
Ogbulezie, Julie
University of Calabar
Global Solar Radiation; Sunshine Based Models; Statistical Indicators; Tropical Rainforest Zone; Lagos.
Several empirical models have been fitted in literature for estimating global solar radiation across the globe in order to produce global solar radiation data and also as a baseline for further scientific and environmental research without the substantial cost of instrumental network that would otherwise be needed. However, peers and researchers have reported that the most commonly employed parameter for predicting global solar radiation is sunshine duration as a result of its availability and simplicity in course of measurement globally. In this research, the author considered the performance of 63 sunshine-based models for the prediction of global solar radiation at Lagos, Nigeria. Numerous models are found unreliable for use in this location, and others vary in performance. On the whole, the best model was identified due to its values of statistical indicators.
Science Publishing Corporation
2017-07-06 04:38:27
application/pdf
https://www.sciencepubco.com/index.php/IJAA/article/view/8308
International Journal of Advanced Astronomy; Vol 5, No 2 (2017)
eng
Copyright (c) 2017 International Journal of Advanced Astronomy