Quasinormal modes and classical wave propagation in analogue black holes

Details Quasinormal modes and classical wave propagation in analogue black holes Quasinormal modes and classical wave propagation in analogue black holes

2004-08-31

arxiv.org/abs/gr-qc/0408099v2

Phys.Rev. D70 (2004) 124006

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

19 pages, 12 figures, ReVTeX4; v2: minor modifications and corrections

Scientific paper

10.1103/PhysRevD.70.124006

Many properties of black holes can be studied using acoustic analogues in the laboratory through the propagation of sound waves. We investigate in detail sound wave propagation in a rotating acoustic (2+1)-dimensional black hole, which corresponds to the ``draining bathtub'' fluid flow. We compute the quasinormal mode frequencies of this system and discuss late-time power-law tails. Due to the presence of an ergoregion, waves in a rotating acoustic black hole can be superradiantly amplified. We compute superradiant reflection coefficients and instability timescales for the acoustic black hole bomb, the equivalent of the Press-Teukolsky black hole bomb. Finally we discuss quasinormal modes and late-time tails in a non-rotating canonical acoustic black hole, corresponding to an incompressible, spherically symmetric (3+1)-dimensional fluid flow.

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