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

Jean-Loic Kneur·Marcus B. Pinto
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Abstract

In 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.

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Jean-Loic Kneur, Marcus B. Pinto. 2004-09-10. Exact 1/N and Optimized Perturbative Evaluation of mu_c for Homogeneous Interacting Bose Gases. https://doi.org/10.1103/physreva.71.033613

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