Gravitational lensing in the Simpson-Visser black-bounce spacetime in a strong deflection limit

N Tsukamoto - Physical Review D, 2021 - APS
Physical Review D, 2021APS
A Simpson-Visser spacetime has two non-negative parameters a and m and its metric is
correspond with (i) a Schwarzschild metric for a= 0 and m≠ 0,(ii) a regular black hole metric
for a< 2 m,(iii) a one-way traversable wormhole metric for a= 2 m,(vi) a two-way traversable
wormhole metric for a> 2 m, and (v) an Ellis-Bronnikov wormhole metric for a≠ 0 and m= 0.
The spacetime is one of the most useful spacetimes for the purpose of comprehensively
understanding gravitational lensing of light rays reflected by a photon sphere of black holes …
A Simpson-Visser spacetime has two non-negative parameters and and its metric is correspond with (i) a Schwarzschild metric for and , (ii) a regular black hole metric for , (iii) a one-way traversable wormhole metric for , (vi) a two-way traversable wormhole metric for , and (v) an Ellis-Bronnikov wormhole metric for and . The spacetime is one of the most useful spacetimes for the purpose of comprehensively understanding gravitational lensing of light rays reflected by a photon sphere of black holes and wormholes. We have investigated gravitational lensing in the Simpson-Visser spacetime in a strong deflection limit in all the non-negative parameters of and . In a case of , two photon spheres and an antiphoton sphere at the throat degenerate into a marginally unstable photon sphere. The deflection angle of the light rays reflected by the marginally unstable photon sphere at the throat diverges nonlogarithmically in the strong deflection limit.
American Physical Society
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