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

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 wavefront and a fan-shaped series of precursors.

References in corpus (5)

• Stochastic properties of systems controlled by autocatalytic reactions II
• Oblique dark solitons in supersonic flow of a Bose-Einstein condensate
• Quantum fluid effects and parametric instabilities in microcavities
• Propagation of sound in a Bose Einstein condensate in an optical lattice
• Beyond the Landau Criterion for Superfluidity

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