Excised acoustic black holes: the scattering problem in the time domain
arXiv:gr-qc/0504048 · doi:10.1103/PhysRevD.72.084016
Abstract
The scattering process of a dynamic perturbation impinging on a draining-tub model of an acoustic black hole is numerically solved in the time domain. Analogies with real black holes of General Relativity are explored by using recently developed mathematical tools involving finite elements methods, excision techniques, and constrained evolution schemes for strongly hyperbolic systems. In particular it is shown that superradiant scattering of a quasi-monochromatic wavepacket can produce strong amplification of the signal, offering the possibility of a significant extraction of rotational energy at suitable values of the angular frequency of the vortex and of the central frequency of the wavepacket. The results show that theoretical tools recently developed for gravitational waves can be brought to fruition in the study of other problems in which strong anisotropies are present.
arXiv comment8 pages, 9 figures
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- The effective geometry of the uniformly rotating self-gravitating polytrope
- Acoustic Superradiance from a Bose-Einstein Condensate Vortex with a Self-Consistent Background Density Profile
- Effects of the Quantum Potential on lower dimensional models of analogue gravity
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