Hawking-like radiation does not require a trapped region

Abstract

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.

revtex4, 4 pages, 1 figure

References in corpus (8)

• Analogue Gravity
• Acoustic black holes: horizons, ergospheres, and Hawking radiation
• Black Hole Evaporation without Information Loss
• On the Universality of the Hawking Effect
• Causal structure of acoustic spacetimes
• Quasi-particle creation by analogue black holes
• Black-hole horizon and metric singularity at the brane separating two sliding superfluids
• Hawking-Unruh Thermal Radiance as Relativistic Exponential Scaling of Quantum Noise

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