Fermat's principle in constant gravitational field
Joanna Gonera, Piotr Kosinski, Joanna Piwnik
TL;DR
This paper explores Fermat's principle within a constant gravitational field, explaining the origin of closed light rings in Kerr black holes and deriving a more general theoretical result.
Contribution
It provides a new explanation for closed light rings in Kerr black holes and generalizes previous findings.
Findings
Closed light rings are explained through Fermat's principle.
A more general theoretical framework for light rings is derived.
The results deepen understanding of light behavior in strong gravitational fields.
Abstract
Recently (Int.Journ.Mod.Phys. D27 (2018), 1847025) an interesting property of closed light rings in Kerr black holes has been noticed. We explain its origin and derive a slightly more general result.
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