Strong gravitational lensing in a charged squashed Kaluza–Klein Gödel black hole

Sadeghi, J.; Naji, J.; Vaez, H.

doi:10.1016/j.physletb.2013.11.047

Cited by 21 publications

(11 citation statements)

References 86 publications

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“…The study of gravitational lensing is not only limited to the Schwarzschild black hole. Lensing by other black holes such as Reissner-Nordström [15][16][17][18], Kerr [19][20][21], Kiselev [22,23], global monopole [24][25][26], Einstein-Born-Infeld [27], Eddington-Born-Infeld [28][29][30], scalar-tensor [31,32], braneworld [33][34][35][36], dilaton [37][38][39][40], phantom [41,42], regular [43][44][45][46], Kaluza-Klein [47][48][49][50], Horava-Lifshitz [51], Myers-Perry [52] and Galileon [53] black holes, have been studied. Gravitational lensing by naked singularities has been analyzed to see whether one can distinguish between a black hole and a naked singularity [54][55][56][57][58].…”

Section: Introductionmentioning

confidence: 99%

Gravitational lensing by scalar-tensor wormholes and the energy conditions

Shaikh

Kar

2017

Phys. Rev. D

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We study gravitational lensing by a class of zero Ricci scalar wormholes which arise as solutions in a scalar-tensor theory of gravity. An attempt is made to find a possible link between lensing features, stable/unstable photon orbits and the energy conditions on the matter required to support these spacetimes. Our analysis shows (for this class of wormholes) that light rays always exhibit a positive deflection if the energy conditions are satisfied (nonexotic matter content). In contrast, if the energy conditions are violated (exotic matter), the net deflection of a light ray may be positive, negative or even zero, depending on values of the metric and impact parameters. This prompts us to introduce a surface defined by a turning point value at which the net deflection of a light ray is equal to zero, even though we have a curved spacetime geometry. We argue that the existence of such a surface may be linked to exotic/energy condition violating matter. Wormholes in modified gravity with matter satisfying the energy conditions do not seem to have such a zero deflection surface. Finally, we study strong gravitational lensing briefly and also look into the formation of Einstein and relativistic Einstein rings. We conclude with some estimates on the wormhole mass, throat-radius and the detectability of the Einstein rings. * rajibulshaikh@cts.iitkgp.ernet.in; Present address:

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Section: Introductionmentioning

confidence: 99%

Gravitational lensing by scalar-tensor wormholes and the energy conditions

Shaikh

Kar

2017

Phys. Rev. D

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“…quasinormal modes [114][115][116], gyroscope precession [117,118], thin accretion disk [119], Xray reflection spectroscopy [120], light deflection [121], strong gravitational lensing [122][123][124][125][126] and black hole shadow [127,128].…”

Section: Introductionmentioning

confidence: 99%

Hawking radiation of scalar particles and fermions from squashed Kaluza-Klein black holes based on a generalized uncertainty principle

Matsuno

2021

Preprint

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We consider the Hawking radiation by the tunneling of charged fermions and charged scalar particles from the five-dimensional charged static squashed Kaluza-Klein black hole based on the generalized uncertainty principle. We derive corrections of the Hawking temperature to general relativity, which are related to the energy of the emitted particle, the size of the extra dimension, the charge of the black hole and the quantum effect predicted by the generalized uncertainty principle. It is shown that the quantum correction may slow down the increase of the Hawking temperature, which may lead to the thermodynamic stable remnant after the evaporation of the squashed Kaluza-Klein black hole.

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“…Then squashed Kaluza-Klein black hole solutions with a twisted compactified extra dimension would describe the geometry around the compact objects. Several aspects of squashed Kaluza-Klein black holes are discussed, for example, multi-black holes [13][14][15], stabilities [16,17], quasinormal modes [18][19][20], thin accretion disk [21], X-ray reflection spectroscopy [22], gyroscope precession [23,24], strong gravitational lensing [25][26][27][28][29] and black hole shadow [30,31].…”

Section: Introductionmentioning

confidence: 99%

Light deflection by squashed Kaluza-Klein black holes in a plasma medium

Matsuno

2020

Preprint

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We study motions of photons in an unmagnetized cold homogeneous plasma medium in the five-dimensional charged static squashed Kaluza-Klein black hole spacetime. In this case, a photon behaves as a massive particle in a four-dimensional spherically symmetric spacetime. We consider the light deflection by the squashed Kaluza-Klein black hole surrounded by the plasma in a weakfield limit. We derive corrections of the deflection angle to general relativity, which are related to the size of the extra dimension, the charge of the black hole and the ratio between the plasma and the photon frequencies.

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Strong gravitational lensing in a charged squashed Kaluza–Klein Gödel black hole

Cited by 21 publications

References 86 publications

Gravitational lensing by scalar-tensor wormholes and the energy conditions

Gravitational lensing by scalar-tensor wormholes and the energy conditions

Hawking radiation of scalar particles and fermions from squashed Kaluza-Klein black holes based on a generalized uncertainty principle

Light deflection by squashed Kaluza-Klein black holes in a plasma medium

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