Formation of a sonic horizon in isotropically expanding Bose-Einstein condensates

Details Formation of a sonic horizon in isotropically expanding Bose-Einstein condensates Formation of a sonic horizon in isotropically expanding Bose-Einstein condensates

2007-04-09

arxiv.org/abs/0704.1096v3

Phys. Rev.A76:053603, 2007

Physics

Condensed Matter

Other Condensed Matter

7 pages, 8 figures; Final version, accepted to Phys.Rev. A

Scientific paper

10.1103/PhysRevA.76.053603

We propose a simple experiment to create a sonic horizon in isotropically trapped cold atoms within currently available experimental techniques. Numerical simulation of the Gross-Pitaevskii equation shows that the sonic horizon should appear by making the condensate expand. The expansion is triggered by changing the interaction which can be controlled by the Feshbach resonance in real experiments. The sonic horizon is shown to be quasi-static for sufficiently strong interaction or large number of atoms. The characteristic temperature that is associated with particle emission from the horizon, which corresponds to the Hawking temperature in an ideal situation, is estimated to be a few nK.

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