Transition Temperature of the homogeneous, weakly interacting Bose gas

Details Transition Temperature of the homogeneous, weakly interacting Bose gas Transition Temperature of the homogeneous, weakly interacting Bose gas

1999-05-13

arxiv.org/abs/cond-mat/9905198v2

Phys. Rev. Lett. 83, 2687 (1999)

Physics

Condensed Matter

Statistical Mechanics

4 pages, revtex, 3 eps figures

Scientific paper

10.1103/PhysRevLett.83.2687

We present a Monte Carlo calculation for up to $N \sim 20 000$ bosons in 3 D to determine the shift of the transition temperature due to small interactions $a$. We generate independent configurations of the ideal gas. At finite $N$, the superfluid density changes by a certain correlation function in the limit $a \to 0$; the $N \to \infty$ limit is taken afterwards. We argue that our result is independent of the order of limits. Detailed knowledge of the non-interacting system for finite $N$ allows us to avoid finite-size scaling assumptions.

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