Nonuniversal Effects in the Homogeneous Bose Gas

Details Nonuniversal Effects in the Homogeneous Bose Gas Nonuniversal Effects in the Homogeneous Bose Gas

2000-12-04

arxiv.org/abs/cond-mat/0012043v1

Phys.Rev. A63 (2001) 063609

Physics

Condensed Matter

Statistical Mechanics

24 pages, RevTex, 5 ps figures, included with epsf.tex

Scientific paper

10.1103/PhysRevA.63.063609

Effective field theory predicts that the leading nonuniversal effects in the homogeneous Bose gas arise from the effective range for S-wave scattering and from an effective three-body contact interaction. We calculate the leading nonuniversal contributions to the energy density and condensate fraction and compare the predictions with results from diffusion Monte Carlo calculations by Giorgini, Boronat, and Casulleras. We give a crude determination of the strength of the three-body contact interaction for various model potentials. Accurate determinations could be obtained from diffusion Monte Carlo calculations of the energy density with higher statistics.

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