We study scalar test-field perturbations on top of a Kerr-black-bounce background, i.e., a family of rotating regular black holes and/or rotating traversable wormholes that can mimic Kerr black holes. We compute the quasinormal modes for a massless field in both the regular black holes and wormhole branches, confirming the stability of the former and identifying a set of growing modes that renders the latter unstable. We further compute the superradiance amplification factors, for massless and massive fields, in the regular black hole branch, confirming that these objects superradiate, though to a lesser degree than the corresponding Kerr black holes.

Scalar perturbations around rotating regular black holes and wormholes: Quasinormal modes, ergoregion instability, and superradiance / Franzin, Edgardo; Liberati, Stefano; Mazza, Jacopo; Dey, Ramit; Chakraborty, Sumanta. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 105:12(2022). [10.1103/physrevd.105.124051]

Scalar perturbations around rotating regular black holes and wormholes: Quasinormal modes, ergoregion instability, and superradiance

Franzin, Edgardo
;
Liberati, Stefano;Mazza, Jacopo;
2022-01-01

Abstract

We study scalar test-field perturbations on top of a Kerr-black-bounce background, i.e., a family of rotating regular black holes and/or rotating traversable wormholes that can mimic Kerr black holes. We compute the quasinormal modes for a massless field in both the regular black holes and wormhole branches, confirming the stability of the former and identifying a set of growing modes that renders the latter unstable. We further compute the superradiance amplification factors, for massless and massive fields, in the regular black hole branch, confirming that these objects superradiate, though to a lesser degree than the corresponding Kerr black holes.
2022
105
12
124051
10.1103/physrevd.105.124051
https://arxiv.org/abs/2201.01650
Franzin, Edgardo; Liberati, Stefano; Mazza, Jacopo; Dey, Ramit; Chakraborty, Sumanta
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/131130
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