Anomalous condensate fluctuations in strongly interacting superfluids

Details Anomalous condensate fluctuations in strongly interacting superfluids Anomalous condensate fluctuations in strongly interacting superfluids

1999-06-23

arxiv.org/abs/cond-mat/9906344v2

Physics

Condensed Matter

Statistical Mechanics

3 pages, Revtex, no figures. submitted to PRA

Scientific paper

10.1103/PhysRevA.60.5133

We show that the condensate occupation of a superfluid Bose liquid quite generally exhibits anomalously large fluctuations at finite temperatures. In three dimensions, the variance scales like T^2 V^{4/3} at low T, generalizing the result obtained by Giorgini, Pitaevskii, and Stringari for a weakly interacting Bose gas. In two dimensions there is only a quasicondensate, and the fluctuations are of the same order as the mean value.

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