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A Variational Sum-Rule Approach to Collective Excitations of a Trapped Bose-Einstein Condensate

Takashi Kimura, Hiroki Saito, Masahito Ueda

cond-mat.softarXiv:cond-mat/9803130

Abstract

It is found that combining an excitation-energy sum rule with Fetter's trial wave function gives almost exact low-lying collective-mode frequencies of a trapped Bose-Einstein condensate at zero temperature.

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