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Dissipation and Vortex Creation in Bose-Einstein Condensed Gases
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Dissipation and Vortex Creation in Bose-Einstein Condensed Gases
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We solve the Gross-Pitaevskii equation to study energy transfer from an oscillating `object' to a trapped Bose-Einstein condensate. Two regimes are found: for object velocities below a critical value, energy is transferred by excitation of phonons at the motion extrema; while above the critical velocity, energy transfer is via vortex formation. The second regime corresponds to significantly enhanced heating, in agreement with a recent experiment.
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