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Superradiance in Kerr-like black holes

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arxiv 2102.03152 v2 pith:ANEOOOJW submitted 2021-02-05 gr-qc astro-ph.HE

Superradiance in Kerr-like black holes

Edgardo Franzin , Stefano Liberati , Mauro Oi This is my paper
classification gr-qc astro-ph.HE
keywords blackkerrsuperradiancedeformationfieldsholeskerr-likeparameter
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Recent strong-field regime tests of gravity are so far in agreement with general relativity. In particular, astrophysical black holes appear all to be consistent with the Kerr spacetime, but the statistical error on current observations allows for small yet detectable deviations from this description. Here we study superradiance of scalar and electromagnetic test fields around the Kerr-like Konoplya--Zhidenko black hole and we observe that for large values of the deformation parameter superradiance is highly suppressed with respect to the Kerr case. Surprisingly, there exists a range of small values of the deformation parameter for which the maximum amplification factor is larger than the Kerr one. We also provide a first result about the superradiant instability of these non-Kerr spacetimes against massive scalar fields.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Confronting eikonal and post-Kerr methods with numerical evolution of scalar field perturbations in spacetimes beyond Kerr

    gr-qc 2026-01 unverdicted novelty 5.0

    Numerical simulations benchmark the eikonal and post-Kerr approximations for quasinormal modes in deformed Kerr spacetimes, quantifying their errors relative to expected observational precision.

  2. Imaging and Polarimetric Signatures of Konoplya-Zhidenko Black Holes with Various Thick Disk

    astro-ph.HE 2025-10 unverdicted novelty 5.0

    Horizon-scale synchrotron images and polarization maps of Konoplya-Zhidenko black holes with thick disks show expanded photon rings, darker centers, and viewing-angle-dependent asymmetries that vary with the deformati...