arxiv: cond-mat/0612114 · v1 · pith:6CHZB42Anew · submitted 2006-12-05 · ❄️ cond-mat.other

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

I. Carusotto , S. X. Hu , L. A. Collins , A. Smerzi This is my paper

classification ❄️ cond-mat.other

keywords bogoliubovbose-einsteincondensatedensityflowingobstacleappearsbogoliubov-cerenkov

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

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