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Bogoliubov-Cerenkov radiation in a Bose-Einstein condensate flowing against an obstacle
I Carusotto1, S X Hu, L A Collins
1CNR-BEC-INFM, Trento, I-38050 Povo, Italy.
Abstract:
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 wave front and a fan-shaped series of precursors.
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