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Hawking-like radiation does not require a trapped region

AuthorsBarceló, Carlos ; Liberati, Stefano; Sonego, Sebastiano; Visser, Matt
KeywordsGeneral Relativity and Quantum Cosmology
Hawking radiation
Trapped regions
Acoustic spacetimess
Issue Date3-Jul-2006
PublisherAmerican Physical Society
CitationPhys.Rev.Lett. 97 (2006) 171301
AbstractWe 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.
Descriptionrevtex4, 4 pages, 1 figure.-- Final version of the paper available at: http://prl.aps.org/
Appears in Collections:(IAA) Artículos
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