A superradiance resonance cavity outside rapidly rotating black holes

Details A superradiance resonance cavity outside rapidly rotating black holes A superradiance resonance cavity outside rapidly rotating black holes

1999-09-16

arxiv.org/abs/gr-qc/9909050v1

Phys.Rev.Lett. 84 (2000) 4537-4540

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages, 2 postscript figures

Scientific paper

10.1103/PhysRevLett.84.4537

We discuss the late-time behaviour 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 behaviour may be relevant for astrophysical black holes, and that it can be understood in terms of the presence of a ``superradiance resonance cavity'' immediately outside the black hole.

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