First and second sound in a uniform Bose gas

Preprint

5 July 1997

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/9707058

Abstract

We have recently derived two-fluid hydrodynamic equations for a trapped weakly-interacting Bose gas. In this paper, we use these equations to discuss first and second sound in a uniform Bose gas. These results are shown to agree with the predictions of the usual two-fluid equations of Landau when the thermodynamic functions are evaluated for a weakly-interacting gas. In a uniform gas, second sound mainly corresponds to an oscillation of the superfluid (the condensate) and is the low frequency continuation of the Goldstone-Bogoliubov symmetry-breaking mode.

Keywords

WEAKLY INTERACTING
UNIFORM BOSE GAS
RECENTLY DERIVED
SECOND SOUND
OSCILLATION
TWO FLUID

All Related Versions

Version 1, 1997-07-05, ArXiv
Published version: Physical Review A, 56 (6), 4839.

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