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Light rings of stationary spacetimes · Around

2021

Light rings of stationary spacetimes

Ghosh, Rajes, Sarkar, Sudipta

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We present a novel theorem regarding light rings in a stationary spacetime with an ergoregion.

We prove that any stationary, axisymmetric, and asymptotically flat spacetime in 1 + 3 dimensions with an ergoregion must have at least one light ring outside the ergoregion.
A possible extension of the proof for asymptotically de-Sitter and anti-de-Sitter spherically symmetric black holes is also discussed.

Built on

A. K. Mishra, S. Chakraborty and S. Sarkar, Phys. Rev. D 99
Original
1903
Earlier work this paper cites.
K. Akiyama et al
Original
1906
Earlier work this paper cites.
P. Cunha, V.P. and C. A. R. Herdeiro, Phys. Rev. Lett. 124
Original
2003
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