Recent astronomical tests of general relativity

Treschman, Keith John

doi:10.5897/ijps2014.4236

Int. J. Phys. Sci.

2015

DOI: 10.5897/ijps2014.4236

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Recent astronomical tests of general relativity

Keith John Treschman¹

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Cited by 4 publications

References 69 publications

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General Relativity in Australian Newspapers: The 1919 and 1922 Solar Eclipse Expeditions

Treschman¹

2015

Hist. Rec. Aust. Sci.

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In 1922 there was a total solar eclipse with the central track traversing the Australian continent from Western Australia, through South Australia and across Queensland. Local and overseas astronomers mounted major observing campaigns to verify the amount of gravitational light bending predicted by the Theory of General Relativity. This paper looks at how the media reported the results from previous expeditions in 1919,whichwere conducted by the British, and the necessity for the 1922 measurements in Australia. It was this latter local eclipse that was the impetus for Australian correspondents to report on General Relativity. In general, the Australian newspapers chronicled informatively and accurately, they provided a good coverage of the eclipse parties and stressed the significance of the 1922 investigations. Additional keywords: 1919 eclipse, 1922 eclipse, Australian newspapers, Australian public, General Relativity, gravitational deflection, gravitational redshift, Mercury anomaly.

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General Relativity in Australian Newspapers: The 1919 and 1922 Solar Eclipse Expeditions

Treschman¹

2015

Hist. Rec. Aust. Sci.

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Redshift of photons emitted from the accretion disk of a regular black hole surrounded by dark matter

Narzilloev

Abdujabbarov

Hakimov

2022

Int. J. Mod. Phys. A

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In this paper, we have investigated the motion of photons as well as the frequency shift of photons emitted by geodesic particles influenced by the central black hole (BH) described by Bardeen solution surrounded by perfect fluid dark matter (PFDM). It has been shown that in general there are two stable photon spheres formed due to the gravitational attraction of photons by the central gravitating compact object. It has been obtained that with the increase of the space–time parameters these photon spheres come close to each other until they merge forming unique photon sphere around central BH. Investigation of the frequency shift of photons radiated by the particles geodesically moving in the equatorial plane has shown that the former becomes stronger for the bigger values of the intensity of PFDM and smaller values of the magnetic charge of the Bardeen solution.

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Constraints on Newtonian Interplanetary Point-Mass Interactions in Multicomponent Systems from the Symmetry of Their Cycles

Hofmeister

Criss

2021

Symmetry

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Interplanetary interactions are the largest forces in our Solar System that disturb the planets from their elliptical orbits around the Sun, yet are weak (<10−3 Solar). Currently, these perturbations are computed in pairs using Hill’s model for steady-state, central forces between one circular and one elliptical ring of mass. However, forces between rings are not central. To represent interplanetary interactions, which are transient, time-dependent, and cyclical, we build upon Newton’s model of interacting point-mass pairs, focusing on circular orbits of the eight largest bodies. To probe general and evolutionary behavior, we present analytical and numerical models of the interplanetary forces and torques generated during the planetary interaction cycles. From symmetry, over a planetary interaction cycle, radial forces dominate while tangential forces average to zero. Our calculations show that orbital perturbations require millennia to quantify, but observations are only over ~165 years. Furthermore, these observations are compromised because they are predominantly made from Earth, whose geocenter occupies a complex, non-Keplerian orbit. Eccentricity and inclination data are reliable and suggest that interplanetary interactions have drawn orbital planes together while elongating the orbits of the two smallest planets. This finding is consistent with conservation principles governing the eight planets, which formed as a system and evolve as a system.

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Recent astronomical tests of general relativity

Cited by 4 publications

References 69 publications

General Relativity in Australian Newspapers: The 1919 and 1922 Solar Eclipse Expeditions

General Relativity in Australian Newspapers: The 1919 and 1922 Solar Eclipse Expeditions

Redshift of photons emitted from the accretion disk of a regular black hole surrounded by dark matter

Constraints on Newtonian Interplanetary Point-Mass Interactions in Multicomponent Systems from the Symmetry of Their Cycles

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