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gr-qc2026
How Universal Is the Black Hole Zeroth Law?
Rajes Ghosh, Sudipta Sarkar
The black hole zeroth law asserts the thermal equilibrium of a stationary Killing horizon, yet its status beyond general relativity remains limited. We demonstrate that its validit…
gr-qc2026
Quasinormal Ringdown and Echoes in Accreting Exotic Compact Objects
Chanchal Sharma, Kabir Chakravarti, Sudipta Sarkar
Exotic compact objects (ECOs) may produce late-time gravitational-wave (GW) echoes, but sufficiently compact ECOs undergoing realistic accretion may eventually form an event horizo…