Abstract
Density fluctuations in Bose gases are investigated in the collisionless limit at finite temperature. First the density fluctuations of a homogenous Bose gas above the phase transition are analysed in linear response theory. Their complex velocity of sound is determined, finding a pure relaxation-mode for weak interactions. Then we consider the coupled dynamics of a condensate interacting with the density of non-condensed atoms, and determine numerically and in perturbation theory the temperature dependent damping rate of the Bogoliubov sound. Using a local-density-approximation we generalize this approach to inhomogeneous systems.
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Fliesser, M., Graham, R. (2001). Density Oscillations in Trapped Bose Condensates at Finite Temperature. In: Carmichael, H.J., Glauber, R.J., Scully, M.O. (eds) Directions in Quantum Optics. Lecture Notes in Physics, vol 561. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-40894-0_1
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DOI: https://doi.org/10.1007/3-540-40894-0_1
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