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Scalar perturbations around rotating regular black holes and wormholes: quasi-normal modes, ergoregion instability and superradiance

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arxiv 2201.01650 v3 pith:F2QJ264Y submitted 2022-01-05 gr-qc

Edgardo Franzin , Stefano Liberati , Jacopo Mazza , Ramit Dey , Sumanta Chakraborty This is my paper · ORCID
classification gr-qc
keywords blackholesregularmodesrotatingcomputeconfirmingkerr
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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 quasi-normal 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.

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Cited by 4 Pith papers

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