We present a unified approach for the study of idealized gravitational compact objects like wormholes (WHs) and horizonless stars, here simulated by the presence of boundary conditions at a deeply inner wall. At the 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 the quantum level, we show that static WHs do not radiate.

A WKB formula for echoes / Sebastiani, Lorenzo; Vanzo, Luciano; Zerbini, Sergio. - In: INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS. - ISSN 0219-8878. - STAMPA. - 16:12(2019), pp. 1-28. [10.1142/S0219887819501810]

A WKB formula for echoes

Sebastiani, Lorenzo;Vanzo, Luciano;Zerbini, Sergio
2019-01-01

Abstract

We present a unified approach for the study of idealized gravitational compact objects like wormholes (WHs) and horizonless stars, here simulated by the presence of boundary conditions at a deeply inner wall. At the 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 the quantum level, we show that static WHs do not radiate.
2019
12
Sebastiani, Lorenzo; Vanzo, Luciano; Zerbini, Sergio
A WKB formula for echoes / Sebastiani, Lorenzo; Vanzo, Luciano; Zerbini, Sergio. - In: INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS. - ISSN 0219-8878. - STAMPA. - 16:12(2019), pp. 1-28. [10.1142/S0219887819501810]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/253596
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