Quasi-particle creation by analogue black holes

Details Quasi-particle creation by analogue black holes Quasi-particle creation by analogue black holes

2006-04-12

arxiv.org/abs/gr-qc/0604058v1

Class.Quant.Grav. 23 (2006) 5341-5366

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

30 pages, 16 figures

Scientific paper

10.1088/0264-9381/23/17/014

We discuss the issue of quasi-particle production by ``analogue black holes'' with particular attention to the possibility of reproducing Hawking radiation in a laboratory. By constructing simple geometric acoustic models, we obtain a somewhat unexpected result: We show that in order to obtain a stationary and Planckian emission of quasi-particles, it is not necessary to create an ergoregion in the acoustic spacetime (corresponding to a supersonic regime in the flow). It is sufficient to set up a dynamically changing flow either eventually generating an arbitrarily small sonic region v=c, but without any ergoregion, or even just asymptotically, in laboratory time, approaching a sonic regime with sufficient rapidity.

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