Stability of the homogeneous Bose-Einstein condensate at large gas parameter

Details Stability of the homogeneous Bose-Einstein condensate at large gas parameter Stability of the homogeneous Bose-Einstein condensate at large gas parameter

2008-01-09

arxiv.org/abs/0801.1387v2

Physics

Condensed Matter

Statistical Mechanics

9 pages, 3 figures, Revtex

Scientific paper

10.1103/PhysRevA.77.033626

The properties of the uniform Bose gas is studied within the optimized variational perturbation theory (Gaussian approximation) in a self-consistent way. It is shown that the atomic BEC with a repulsive interaction becomes unstable when the gas parameter gamma=rho a^3 exceeds a critical value gamma_{crit} ~ 0.01. The quantum corrections beyond the Bogoliubov-Popov approximation to the energy density, chemical potential and pressure in powers of gamma expansions are presented.

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