T_c for homogeneous dilute Bose gases: a second-order result
arXiv:cond-mat/0107124 · doi:10.1103/PhysRevA.65.013606
Abstract
The transition temperature for a dilute, homogeneous, three-dimensional Bose gas has the expansion T_c = T_0 {1 + c_1 a n^(1/3) + [c_2' ln(a n^(1/3)) + c_2''] a^2 n^(2/3) + O(a^3 n)}, where a is the scattering length, n the number density, and T_0 the ideal gas result. The first-order coefficient c_1 depends on non-perturbative physics. In this paper, we show that the coefficient c_2' can be computed perturbatively. We also show that the remaining second-order coefficient c_2'' depends on non-perturbative physics but can be related, by a perturbative calculation, to quantities that have previously been measured using lattice simulations of three-dimensional O(2) scalar field theory. Making use of those simulation results, we find T_c = T_0 {1 + (1.32+-0.02) a n^(1/3) + [19.7518 ln(a n^(1/3)) + (75.7+-0.4)] a^2 n^(2/3) + O(a^3 n)}.
30 pages; sign typo in abstract fixed
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