1206.5787 (S. P. Cockburn et al.)

Ab initio methods for finite temperature two-dimensional Bose gases    [PDF]

S. P. Cockburn, N. P. Proukakis

The stochastic Gross-Pitaevskii equation and modified Popov theory are shown to provide an ab initio description of finite temperature, weakly-interacting two-dimensional Bose gas experiments. Using modified Popov theory, a systematic approach is developed in which the momentum cut-off inherent to classical field methods is removed as a free parameter. This is shown to yield excellent agreement with the recent experiment of Hung et al. [Nature, 470, 236 (2011)], verifying that the stochastic Gross-Pitaevskii equation captures the observed universality and scale-invariance.

View original: http://arxiv.org/abs/1206.5787