Exact 1/N and Optimized Perturbative Evaluation of mu_c for Homogeneous Interacting Bose Gases

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dc.creatorKneur, Jean-Loic
dc.creatorPinto, Marcus B.
dc.date2004-08-25
dc.date2004-09-10
dc.date.accessioned2026-07-07T10:48:10Z
dc.date.available2026-07-07T10:48:10Z
dc.descriptionIn the framework of the O(N) three-dimensional effective scalar field model for homogeneous dilute weakly interacting Bose gases we use the 1/N expansion to evaluate, within the large N limit, the parameter r_c which is directly related to the critical chemical potential mu_c. This quantity enters the order-a^2 n^{2/3} coefficient contributing to the critical temperature shift Delta T_c where a represents the s-wave scattering length and n represents the density. Compared to the recent precise numerical lattice simulation results, our calculation suggests that the large N approximation performs rather well even for the physical case N=2. We then calculate the same quantity but using different forms of the optimized perturbative (variational) method, showing that these produce excellent results both for the finite N and large-N cases.
dc.description12 pages, 2 figures. We have performed a refined and extended numerical analysis to take into account the very recent results of Ref. [15]
dc.identifierhttps://arxiv.org/abs/cond-mat/0408538
dc.identifierhttp://arxiv.org/abs/cond-mat/0408538
dc.identifierPhys.Rev.A71:033613,2005
dc.identifierdoi:10.1103/PhysRevA.71.033613
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/183781
dc.subjectOther Condensed Matter
dc.subjectHigh Energy Physics - Theory
dc.titleExact 1/N and Optimized Perturbative Evaluation of mu_c for Homogeneous Interacting Bose Gases
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