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Dielectric formalism and damping of collective modes in trapped Bose-Einstein condensed gases

Gy. Bene, P. Szepfalusy

cond-mat.stat-mecharXiv:cond-mat/9806079

Abstract

We present the general dielectric formalism for Bose-Einstein condensed systems in external potential at finite temperatures. On the basis of a model arising within this framework as a first approximation in an intermediate temperature region for large condensate we calculate the damping of low-energy excitations in the collisionless regime.

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