Quasinormal modes, Superradiance and Area Spectrum for 2+1 Acoustic Black Holes

Abstract

We present an exact expression for the quasinormal modes of acoustic disturbances in a rotating 2+1 dimensional sonic black hole (draining bathtub fluid flow) in the low frequency limit and evaluate the adiabatic invariant proposed by Kunstatter. We also compute,via Bohr-Sommerfeld quantization rule the equivalent area spectrum for this acoustic black hole, and we compute the superradiance phenomena for pure spinning 2+1 black holes.

10 pages, Final version, an appendix and some references was added, accepted by Phys. Lett. B

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