Extremal black holes have external light rings
General Relativity and Quantum Cosmology
2023-02-01 v1 High Energy Astrophysical Phenomena
High Energy Physics - Theory
Abstract
It is proved that spherically symmetric extermal black holes possess at least one external light ring. Our remarkably compact proof is based on the dominant energy condition which characterizes the external matter fields in the non-vacuum extremal black-hole spacetimes.
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Cite
@article{arxiv.2211.15983,
title = {Extremal black holes have external light rings},
author = {Shahar Hod},
journal= {arXiv preprint arXiv:2211.15983},
year = {2023}
}
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9 pages