Superradiant scattering from a hydrodynamic vortex

Details Superradiant scattering from a hydrodynamic vortex Superradiant scattering from a hydrodynamic vortex

2005-01-10

arxiv.org/abs/cond-mat/0501182v1

Class.Quant.Grav.22:3833-3839,2005

Physics

Condensed Matter

Other Condensed Matter

10 pages, 1 figure

Scientific paper

10.1088/0264-9381/22/19/002

We show that sound waves scattered from a hydrodynamic vortex may be amplified. Such superradiant scattering follows from the physical analogy between spinning black holes and hydrodynamic vortices. However a sonic horizon analogous to the black hole event horizon does not exist unless the vortex possesses a central drain, which is challenging to produce experimentally. In the astrophysical domain, superradiance can occur even in the absence of an event horizon: we show that in the hydrodynamic analogue, a drain is not required and a vortex scatters sound superradiantly. Possible experimental realization in dilute gas Bose-Einstein condensates is discussed.

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