Fermat's principle in black-hole spacetimes
General Relativity and Quantum Cosmology
2021-01-27 v1 High Energy Astrophysical Phenomena
High Energy Physics - Theory
Abstract
Black-hole spacetimes are known to possess closed light rings. We here present a remarkably compact theorem which reveals the physically intriguing fact that these unique null circular geodesics provide the {\it fastest} way, as measured by asymptotic observers, to circle around spinning Kerr black holes.
Keywords
Cite
@article{arxiv.2101.06909,
title = {Fermat's principle in black-hole spacetimes},
author = {Shahar Hod},
journal= {arXiv preprint arXiv:2101.06909},
year = {2021}
}
Comments
5 pages. This essay received an Honorable Mention in the 2018 Essay Competition of the Gravity Research Foundation