Kashurnikov V A, Prokof'ev N V, Svistunov B V
Moscow State Engineering Physics Institute, 115409 Moscow, Russia.
Phys Rev Lett. 2001 Sep 17;87(12):120402. doi: 10.1103/PhysRevLett.87.120402. Epub 2001 Aug 28.
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.
我们使用一种高性能蒙特卡罗算法，研究了弱相互作用三维ψ(4)理论（包括量子玻色气体）中相互作用诱导的临界点位移。就临界密度n(c)、质量m、相互作用U和温度T而言，这种位移是普适的：Δn(c)(T)= -Cm³T²U，常数C经计算等于0.0140±0.0005。对于具有散射长度a的量子玻色气体，这意味着ΔT(c)/T(c)= C(0)an^(1/3)，其中C(0)= 1.29±0.05。
