Light rings of stationary spacetimes
General Relativity and Quantum Cosmology
2021-08-11 v1 High Energy Physics - Theory
Abstract
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.
Cite
@article{arxiv.2107.07370,
title = {Light rings of stationary spacetimes},
author = {Rajes Ghosh and Sudipta Sarkar},
journal= {arXiv preprint arXiv:2107.07370},
year = {2021}
}
Comments
5 pages, no figure