2000/11/30 by M. J. Davis, S. A. Morgan, K. Burnett · 1 citation
Physics and Astronomy · #cond-mat
paper · pdf · doi:10.1103/physrevlett.87.160402
published as Phys. Rev. Lett. 87, 160402 (2001) · Four pages, four figures, revtex. Updated to version in PRL. Note that the numerical data has changed since v1, however the conclusions remain the same
arxiv created 2001/10/16 · arxiv updated 2009/11/30
We introduce a time-dependent projected Gross-Pitaevskii equation to describe a partially condensed homogeneous Bose gas, and find that this equation will evolve randomised initial wave functions to equilibrium. We compare our numerical data to the predictions of a gapless, second order theory of Bose-Einstein condensation [S. A. Morgan, J. Phys. B \bf 33, 3847 (2000)], and find that we can determine a temperature when the theory is valid. As the Gross-Pitaevskii equation is non-perturbative, we expect that it can describe the correct thermal behaviour of a Bose gas as long as all relevant modes are highly occupied. Our method could be applied to other boson fields.