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. 2006 Dec 31;97(26):260403.
doi: 10.1103/PhysRevLett.97.260403. Epub 2006 Dec 27.

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

I Carusotto  1 , S X Hu, L A Collins, A Smerzi
Affiliations

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

I Carusotto et al. Phys Rev Lett. .

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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