Bogoliubov-Cerenkov radiation in a Bose-Einstein condensate flowing against an obstacle

Details Bogoliubov-Cerenkov radiation in a Bose-Einstein condensate flowing against an obstacle Bogoliubov-Cerenkov radiation in a Bose-Einstein condensate flowing against an obstacle

2006-12-05

arxiv.org/abs/cond-mat/0612114v1

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

We study the density modulation that appears in a Bose-Einstein condensate flowing with supersonic velocity against an obstacle. The experimental density profiles observed at JILA are reproduced by a numerical integration of the Gross-Pitaevskii equation and then interpreted in terms of Cerenkov emission of Bogoliubov excitations by the defect. The phonon and the single-particle regions of the Bogoliubov spectrum are respectively responsible for a conical wavefront and a fan-shaped series of precursors.

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