Gravitational lensing by rotating wormholes

Jusufi, Kimet; Овгун, Али

doi:10.1103/physrevd.97.024042

Cited by 227 publications

(148 citation statements)

References 49 publications

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“…In the light of the above discussions, it is clearly important and interesting to further study the observational distinctions between black hole and wormhole geometries. For a sampling of recent literature on the topic, we refer the reader to [32][33][34][35][36][37][38][39][40][41][42][43][44] 1 .…”

Section: Introductionmentioning

confidence: 99%

Observational signatures of wormholes with thin accretion disks

Paul

Shaikh

Banerjee

et al. 2020

J. Cosmol. Astropart. Phys.

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We numerically construct images of thin accretion disks in rotating wormhole backgrounds, for the Kerr-like and the Teo class of wormholes. Our construction is illustrated by two methods, a semi-analytic scheme where separated null geodesic equations obtained by analytically integrating the second order equations once are used, as well as by a numerical ray-tracing method utilizing a fourth order Runge-Kutta algorithm. Our result shows dramatic differences between accretion disk images in wormhole backgrounds, compared to black hole ones, specifically because a wormhole can in principle have accretion disks on both sides of its throat. We establish the nature of the images if the observer and the disk are on two opposite sides of the throat, and show that these can provide conclusive observational evidence of wormhole geometries. * svnkr@iitk.ac.in † rshaikh@iitk.ac.in ‡ bpritam@iitk.ac.in § tapo@iitk.ac.in

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Section: Introductionmentioning

confidence: 99%

Observational signatures of wormholes with thin accretion disks

Paul

Shaikh

Banerjee

et al. 2020

J. Cosmol. Astropart. Phys.

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“…Substituting Eqs. (22), (23) and (25) into Eq. (24), one can get the second-order deflection angle of light as following…”

Section: An Example: the Deflection Of Light In Kerr-newman Spacmentioning

confidence: 99%

Equivalence of Gibbons-Werner method to geodesics method in the study of gravitational lensing

Zhou

2020

Phys. Rev. D

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The Gibbons-Werner method where the Gauss-Bonnet theorem is applied to study the gravitational deflection angle has received much attention recently. In this paper, we study the equivalence of the Gibbons-Werner method to the standard geodesics method, and it is shown that the geodesics method can be derived with the Gibbons-Werner method, for asymptotically flat case. In the geodesics method, the gravitational deflection angle of particle depends entirely on the geodesic curvature of the particle ray in the Euclidean space. The gravitational deflection of light in Kerr-Newman spacetime is calculated by different technologies under the Gibbons-Werner framework, as an intuitive example to show the equivalence. PACS numbers: 98.62.Sb, 95.30.Sf

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“…Hence, Eqs. (20) and (27) are simplified to the following expression for the deflection angle of NAT BH in second order due to the weak lensing:…”

Section: A Weak Deflection Angle and Gbtmentioning

confidence: 99%

Effect of Aether Field on Weak Deflection Angle of Black Holes

Овгун¹,

Сакалли²,

Saavedra³

2019

Preprint

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We study the light rays in a static and spherically symmetric gravitational field of null aether theory (NAT). To this end, we employ the Gauss-Bonnet theorem to compute the deflection angle by a NAT black hole in the weak limit approximation. Using the optical metrics of the NAT black hole, we first obtain the Gaussian curvature and then calculate the leading terms of the deflection angle. Our calculations show how gravitational lensing is affected by the NAT field. We also show once again that the bending of light stems from a global and topological effect. 95.30.Sf, 98.62.Sb

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Gravitational lensing by rotating wormholes

Cited by 227 publications

References 49 publications

Observational signatures of wormholes with thin accretion disks

Observational signatures of wormholes with thin accretion disks

Equivalence of Gibbons-Werner method to geodesics method in the study of gravitational lensing

Effect of Aether Field on Weak Deflection Angle of Black Holes

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