T R Slatyer and C M Savage 2005 Class. Quantum Grav. 22 3833 doi:10.1088/0264-9381/22/19/002
T R Slatyer and C M Savage
Show affiliationsSound waves scattered from a hydrodynamic vortex may be amplified. Such superradiant scattering follows from the physical analogy between spinning black holes and hydrodynamic vortices, as spinning black holes have an ergoregion within which low frequency waves may be scattered with increased amplitude. While black holes also have an event horizon, a fluid's analogous sonic horizon requires the vortex to have a central drain, which may be challenging to produce experimentally. We show that in the fluid analogue, a drain is not required in order for a vortex to scatter sound superradiantly. Furthermore, this effect may occur even when the fluid density drops to zero at the vortex core, as is the case in a Bose–Einstein condensate. We also consider engineering the density profile, using repulsive light forces, to extend the validity of the hydrodynamic approximation towards the vortex core.
04.70.-s Physics of black holes
03.75.Kk Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow
Issue 19 (7 October 2005)
Received 1 July 2005, in final form 25 July 2005
Published 8 September 2005
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