First and second sound in a uniform Bose gas
Condensed Matter
2009-10-30 v1
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
Cite
@article{arxiv.cond-mat/9707058,
title = {First and second sound in a uniform Bose gas},
author = {A. Griffin and E. Zaremba},
journal= {arXiv preprint arXiv:cond-mat/9707058},
year = {2009}
}
Comments
14 pages, 5 Postscript figures