Hawking-like radiation does not require a trapped region

Details Hawking-like radiation does not require a trapped region Hawking-like radiation does not require a trapped region

2006-07-03

arxiv.org/abs/gr-qc/0607008v1

Phys.Rev.Lett. 97 (2006) 171301

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

revtex4, 4 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.97.171301

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 a trapped region in the acoustic spacetime (corresponding to a supersonic regime in the fluid flow). It is sufficient to set up a dynamically changing flow asymptotically approaching a sonic regime with sufficient rapidity in laboratory time.

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