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Superradiance resonance cavity outside rapidly rotating black holes

Superradiance resonance cavity outside rapidly rotating black holes
Superradiance resonance cavity outside rapidly rotating black holes
We discuss the late-time behavior of a dynamically perturbed Kerr black hole. We present analytic results for near-extreme Kerr black holes that show that the large number of virtually undamped quasinormal modes that exist for nonzero values of the azimuthal eigenvalue m combine in such a way that the field oscillates with an amplitude that decays as 1/t at late times. This prediction is verified using numerical time evolutions of the Teukolsky equation. We argue that the observed behavior can be understood in terms of the presence of a "superradiance resonance cavity" immediately outside the black hole, and discuss whether it may be relevant for astrophysical black holes.
0031-9007
004537-[4pp]
Andersson, N.
2dd6d1ee-cefd-478a-b1ac-e6feedafe304
Glampedakis, K.
bece2036-f721-468e-9cd2-cf4324ff2deb
Andersson, N.
2dd6d1ee-cefd-478a-b1ac-e6feedafe304
Glampedakis, K.
bece2036-f721-468e-9cd2-cf4324ff2deb

Andersson, N. and Glampedakis, K. (2000) Superradiance resonance cavity outside rapidly rotating black holes. Physical Review Letters, 84, 004537-[4pp]. (doi:10.1103/PhysRevLett.84.4537).

Record type: Article

Abstract

We discuss the late-time behavior of a dynamically perturbed Kerr black hole. We present analytic results for near-extreme Kerr black holes that show that the large number of virtually undamped quasinormal modes that exist for nonzero values of the azimuthal eigenvalue m combine in such a way that the field oscillates with an amplitude that decays as 1/t at late times. This prediction is verified using numerical time evolutions of the Teukolsky equation. We argue that the observed behavior can be understood in terms of the presence of a "superradiance resonance cavity" immediately outside the black hole, and discuss whether it may be relevant for astrophysical black holes.

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Published date: 2000

Identifiers

Local EPrints ID: 29434
URI: https://eprints.soton.ac.uk/id/eprint/29434
ISSN: 0031-9007
PURE UUID: 0a6835e4-22d8-4d30-8edb-84fcc7434085

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Date deposited: 12 May 2006
Last modified: 17 Jul 2017 15:58

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