2006/04/12 by Carlos Barceló, Carlos Barcelo, Stefano Liberati +2 · 3 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Quantum Electrodynamics and Casimir Effect #gr-qc
paper · pdf · doi:10.1088/0264-9381/23/17/014
published as Class.Quant.Grav. 23 (2006) 5341-5366 · 30 pages, 16 figures
arxiv created 2006/04/12 · openalex publication_date 2006/08/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
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 suitable dynamically changing flow. For instance, either a flow that eventually generates an arbitrarily small sonic region v = c , but without any ergoregion, or even a flow that just asymptotically, in laboratory time, approaches a sonic regime with sufficient rapidity.