On a WKB formula for echoes

Abstract

We present an unified approach for the study of idealized gravitational compact objects like wormholes and horizonless stars, here simulated by the presence of boundary conditions at a deeply inner wall. At classical level, namely neglecting quantum effects, the presence of the wall leads to characteristic echoes following the usual ringdown phase, such that it can discriminate black holes from other horizonless, and probably exotic, compact objects. With regard to this issue, an analytical though approximated expression for the complex frequencies of the quasinormal echoes is found and discussed. At quantum level, we show that static wormholes do not radiate.

27 pages, references added, accepted in IJGMMP

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• Quantum effects across dynamical horizons
• Black Holes and Wormholes Beyond Classical General Relativity
• How appropriate are the gravitational entropy proposals for traversable wormholes?
• Stability regions of glued wormholes with massless Kim-Lee backreacted spacetimes as interior