Sound Propagation in Elongated Bose-Einstein Condensed Clouds

Details Sound Propagation in Elongated Bose-Einstein Condensed Clouds Sound Propagation in Elongated Bose-Einstein Condensed Clouds

1997-11-21

arxiv.org/abs/cond-mat/9711224v1

Phys. Rev. A, 58 (1998) 1563

Physics

Condensed Matter

4 pages, revtex, 3 eps figures

Scientific paper

10.1103/PhysRevA.58.1563

We consider propagation of sound pulses along the long axis of a Bose-Einstein condensed cloud in a very anisotropic trap. In the linear regime, we demonstrate that the square of the velocity of propagation is given by the square of the local sound velocity, $c^2=nU_0/m$, averaged over the cross section of the cloud. We also carry out calculations in the nonlinear regime, and determine how the speed of the pulse depends on its amplitude.

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