Jean-Christophe Jaskula, Guthrie B. Partridge, Marie Bonneau, Raphaël Lopes, Josselin Ruaudel, Denis Boiron, Christoph I Westbrook
We have realized an acoustic analog to the Dynamical Casimir effect. The density of a trapped Bose-Einstein condensate is modulated by changing the trap stiffness. We observe the creation of correlated excitations with equal and opposite momenta, and show that for a well defined modulation frequency, the frequency of the excitations is half that of the trap modulation frequency.
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http://arxiv.org/abs/1207.1338
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