title: Critical temperature shift in weakly interacting Bose gas.
abstract: With a high-performance Monte Carlo algorithm we study the interaction-induced shift of the critical point in weakly interacting three-dimensional /psi/(4) theory (which includes quantum Bose gas). In terms of critical density, n(c), mass, m, interaction, U, and temperature, T, this shift is universal: Deltan(c)(T) = -Cm(3)T(2)U, the constant C found to be equal to 0.0140+/-0.0005. For quantum Bose gas with the scattering length a this implies DeltaT(c)/T(c) = C(0)an(1/3), with C(0) = 1.29+/-0.05.
authors.affiliation: Moscow State Engineering Physics Institute, 115409 Moscow, Russia.
authors.forename: V A
authors.initials: VA
authors.lastname: Kashurnikov
authors.forename: N V
authors.initials: NV
authors.lastname: Prokof'ev
authors.forename: B V
authors.initials: BV
authors.lastname: Svistunov