Shift of BEC Temperature of Homogenous Weakly Interacting Bose Gas

Details Shift of BEC Temperature of Homogenous Weakly Interacting Bose Gas Shift of BEC Temperature of Homogenous Weakly Interacting Bose Gas

2004-04-15

arxiv.org/abs/cond-mat/0404354v1

Laser Phys. 14, 586 (2004)

Physics

Condensed Matter

Statistical Mechanics

Talk presented at the 12th International Laser Physics Workshop, LPHYS'03 (Hamburg, Germany, August 25-29, 2003)

Scientific paper

We report on the computation of the shift of the Bose-Einstein condensation temperature for a homogenous weakly interacting Bose gas in leading order in the diluteness parameter a n^(1/3), where `a' is the scattering length and `n' is the particle density. The perturbative series, which is afflicted by infrared divergences, is resummed by means of variational perturbation theory. Using coefficients through seven loops, we arrive at Delta T_c/T_c = 1.27 +/- 0.11 a n^(1/3), which compares favorably with recent Monte-Carlo data.

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