Shift of BEC Temperature of Homogenous Weakly Interacting Bose Gas

Abstract

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.

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

Cited by in corpus (4)

• Representative statistical ensembles for Bose systems with broken gauge symmetry
• Non-universal Critical Quantities from Variational Perturbation Theory and Their Application to the BEC Temperature Shift
• Bose-Einstein condensation temperature of weakly interacting atoms
• Extrapolation of perturbation-theory expansions by self-similar approximants