Ergoregion instability: The hydrodynamic vortex
arXiv:1405.4038 · doi:10.1103/PhysRevD.89.124008
Abstract
Four-dimensional, asymptotically flat spacetimes with an ergoregion but no horizon have been shown to be linearly unstable against a superradiant-triggered mechanism. This result has wide implications in the search for astrophysically viable alternatives to black holes, but also in the understanding of black holes and Hawking evaporation. Here we investigate this instability in detail for a particular setup which can be realized in the laboratory: the {\it hydrodynamic vortex}, an effective geometry for sound waves, with ergoregion and without an event horizon.
10 pages, 8 figures, 2 tables
References in corpus (6)
- Superradiant instabilities in astrophysical systems
- Ergoregion instability of ultra-compact astrophysical objects
- Radiation from the non-extremal fuzzball
- On the ergoregion instability in rotating gravastars
- Black holes in a box: towards the numerical evolution of black holes in AdS
- Quasinormal modes and Regge poles of the canonical acoustic hole
Cited by in corpus (5)
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- Numerical study of superradiant instability for charged stringy black hole-mirror system
- Acoustic clouds: standing sound waves around a black hole analogue
- Scalar clouds in charged stringy black hole-mirror system
- Onset of superradiant instabilities in the hydrodynamic vortex model