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Two-dimensional expansion of a condensed dense Bose gas

We study the expansion dynamics of a condensate in a strongly interacting Bose gas in the presence of an obstacle. Our focus is on the generation of shock waves after the Bose gas has passed the obstacle. The strongly interacting Bose gas is described in the slave-boson representation. A saddle-point approximation provides a nonlinear equation of motion for the macroscopic wave function, analogous to the Gross-Pitaevskii equation of a weakly interacting Bose gas but with different nonlinearity. We compare the results with the Gross-Pitaevskii dynamics of a weakly interacting Bose gas and find a similar behavior with a slower behavior of the strongly interacting system.

preprint2010arXivOpen access
E. S. AnnibaleA. GammalK. Ziegler
nlin.PScond-mat.quant-gas
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E. S. AnnibaleA. GammalK. Ziegler

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