Light rings of stationary spacetimes

Rajes Ghosh; Sudipta Sarkar

Light rings of stationary spacetimes

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arxiv 2107.07370 v1 pith:74BV2XP4 submitted 2021-07-15 gr-qc hep-th

Rajes Ghosh , Sudipta Sarkar This is my paper

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keywords ergoregionlightstationaryasymptoticallyringsspacetimeanti-de-sitteraxisymmetric

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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.

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Radii of spherical timelike geodesics in Kerr-Newman black holes
gr-qc 2025-06 conditional novelty 6.0 of 10

Closed-form and numerical radii, existence conditions, and radial stability are given for spherical timelike orbits in Kerr-Newman spacetimes, including an analytical ISCO radius formula.

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