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- W1780778827 abstract "We consider a three-dimensional weakly interacting Bose gas in the fluctuation region (and its vicinity) of the normal-superfluid phase transition point. We establish relations between basic thermodynamic functions: density, $n(T,mu)$, superfluid density $n_s(T,mu)$, and condensate density, $n_{rm cnd} (T,mu)$. Being universal for all weakly interacting $|psi|^4$ systems, these relations are obtained from Monte Carlo simulations of the classical $|psi|^4$ model on a lattice. Comparing with the mean-field results yields a quantitative estimate of the fluctuation region size. Away from the fluctuation region, on the superfluid side, all the data perfectly agree with the predictions of the quasicondensate mean field theory.--This demonstrates that the only effect of the leading above-the-mean-field corrections in the condensate based treatments is to replace the condensate density with the quasicondensate one in all local thermodynamic relations. Surprisingly, we find that a significant fraction of the density profile of a loosely trapped atomic gas might correspond to the fluctuation region." @default.
- W1780778827 created "2016-06-24" @default.
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- W1780778827 date "2004-01-05" @default.
- W1780778827 modified "2023-09-27" @default.
- W1780778827 title "Weakly interacting Bose gas in the vicinity of the critical point" @default.
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- W1780778827 hasPublicationYear "2004" @default.
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