Critical Temperature Shift in Weakly Interacting Bose Gas
Prokof'ev, Nikolay · Svistunov, Boris · Kashurnikov, V. A.
Original · EN
With a high-performance Monte Carlo algorithm we study the interaction-induced shift of the critical point in weakly interacting three-dimensional |ψ|⁴-theory (which includes quantum Bose gas). In terms of critical density, nc, mass, m, interaction, U, and temperature, T, this shift is universal: Δnc(T) = - C m³ T² U, the constant C found to be equal to 0.0140 ± 0.0005. For quantum Bose gas with the scattering length a this implies ΔTc/Tc = C₀ a n¹/³, with C₀=1.29 ± 0.05.
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