Ghosh, RajesRajesGhoshSarkar, SudiptaSudiptaSarkar2025-08-312025-08-312021-08-1510.1103/PhysRevD.104.0440192-s2.0-85112753714http://repository.iitgn.ac.in/handle/IITG2025/25335We 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.falseArticlehttps://arxiv.org/pdf/2107.073702470002915 August 202157044019arJournal58WOS:000686912300005