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Phase fluctuations in atomic Bose gases

J. O. Andersen, U. Al Khawaja, H. T. C Stoof

cond-matarXiv:cond-mat/0109143

Abstract

We improve on the Popov theory for partially Bose-Einstein condensed atomic gases by treating the phase fluctuations exactly. As a result, the theory becomes valid in arbitrary dimensions and is able to describe the low-temperature crossover between three, two and one-dimensional Bose gases, which is currently being explored experimentally. We consider both homogeneous and trapped Bose gases.

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