Abstract
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 γ exceeds a critical value γ crit ≈ 0.01. The quantum corrections beyond the Bogoliubov—Popov approximation to the energy density, chemical potential and pressure in powers of \(\sqrt{\gamma}\) expansions are presented.
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Rakhimov, A., Narzikulov, Z. (2009). Hohenberg-Martin Dilemma for Bose Condensed Systems and its Solution. In: Casati, G., Matrasulov, D. (eds) Complex Phenomena in Nanoscale Systems. NATO Science for Peace and Security Series B: Physics and Biophysics. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-3120-4_13
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DOI: https://doi.org/10.1007/978-90-481-3120-4_13
Publisher Name: Springer, Dordrecht
Print ISBN: 978-90-481-3118-1
Online ISBN: 978-90-481-3120-4
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