Superradiance in Kerr-like black holes

Franzin, Edgardo; Liberati, Stefano; Oi, Mauro

doi:10.48550/arxiv.2102.03152

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2021

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References 74 publications

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“…There is also the strict hierarchy of orders of expansion, so that one can always distinguish the dominant parameters. As the only general black-hole parametrization it attracted considerable interest during the past few years and various effects were studied for such generalized description of black hole spacetimes [45][46][47][48][49][50][51][52].…”

Section: Introductionmentioning

confidence: 99%

Shadows of parametrized axially symmetric black holes allowing for separation of variables

Konoplya,

Zhidenko

2021

Preprint

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Metric of axially symmetric asymptotically flat black holes in an arbitrary metric theory of gravity can be represented in the general form which depends on infinite number of parameters. We constrain this general class of metrics by requiring of the existence of additional symmetries, which lead to the separation of variables in the Hamilton-Jacobi and Klein-Gordon equations and show that, once the metric functions change sufficiently moderately in some region near the black hole, the blackhole shadow depends on a few deformation parameters only. We analyze the influence of these parameters on the black-hole shadow. We also show that the shadow of the rotating black hole in the Einstein-dilaton-Gauss-Bonnet theory is well approximated if the terms violating the separation of variables are neglected in the metric.

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