Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2008-01-09
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.
Kim Chul Koo
Kim Sang-Hoon
Rakhimov Abdulla
Yee Jae Hyung
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