Towards the Observation of Hawking Radiation in BoseEinstein Condensates
Abstract
Acoustic analogues of black holes (dumb holes) are generated when a supersonic fluid flow entrains sound waves and forms a trapped region from which sound cannot escape. The surface of no return, the acoustic horizon, is qualitatively very similar to the event horizon of a general relativity black hole. In particular Hawking radiation (a thermal bath of phonons with temperature proportional to the "surface gravity") is expected to occur. In this note we consider quasionedimensional supersonic flow of a BoseEinstein condensate (BEC) in a Laval nozzle (convergingdiverging nozzle), with a view to finding which experimental settings could magnify this effect and provide an observable signal. We discuss constraints and problems for our model and identify the issues that should be addressed in the near future in order to set up an experiment. In particular we identify an experimentally plausible configuration with a Hawking temperature of order 70 n K; to be contrasted with a condensation temperature of the order of 90 n K.
 Publication:

International Journal of Modern Physics A
 Pub Date:
 2003
 DOI:
 10.1142/S0217751X0301615X
 arXiv:
 arXiv:grqc/0110036
 Bibcode:
 2003IJMPA..18.3735B
 Keywords:

 04.40.b;
 04.60.m;
 11.10.z;
 45.20.d;
 Selfgravitating systems;
 continuous media and classical fields in curved spacetime;
 Quantum gravity;
 Field theory;
 Formalisms in classical mechanics;
 General Relativity and Quantum Cosmology;
 Condensed Matter;
 High Energy Physics  Theory
 EPrint:
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