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`Superresonance' from a rotating acoustic black hole
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Using the analogy between a shrinking fluid vortex (`draining bathtub'), modelled as a (2+1) dimensional fluid flow with a sink at the origin, and a rotating (2+1) dimensional black hole with an ergosphere, it is shown that a scalar sound wave is reflected from such a vortex with an {\it amplification} for a specific range of frequencies of the incident wave, depending on the angular velocity of rotation of the vortex. We discuss the possibility of observation of this phenomenon, especially for inviscid fluids like liquid HeII, where vortices with quantized angular momentum may occur.
Forward citations
Cited by 3 Pith papers
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Bosonic and Fermionic love number of static acoustic black hole
Static Love numbers for bosonic and fermionic fields around acoustic black holes follow universal power laws for fermions and exhibit logarithmic structures for bosons in lower dimensions.
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Shadow, acoustic redshift, and transfer observables of Lorentz-violating rotating acoustic black holes
Derives shadow width, redshift asymmetry, and flux observables for the Lorentz-violating draining-bathtub acoustic black hole, showing how each observable isolates different combinations of the rotation and violation ...
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Simulating Hawking radiation in quantum many-body systems: deviations from the thermal spectrum
A bosonic hopping model that emulates quantum fields in curved spacetime is shown to reproduce the non-thermal E^2 corrections to Hawking radiation predicted by the tunneling method.
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