Equation of state of an interacting Bose gas at finite temperature: a Path Integral Monte Carlo study

Details Equation of state of an interacting Bose gas at finite temperature: a Path Integral Monte Carlo study Equation of state of an interacting Bose gas at finite temperature: a Path Integral Monte Carlo study

2006-07-27

arxiv.org/abs/cond-mat/0607721v1

Physics

Condensed Matter

Other Condensed Matter

7 pages, 6 figures

Scientific paper

10.1103/PhysRevA.74.043621

By using exact Path Integral Monte Carlo methods we calculate the equation of state of an interacting Bose gas as a function of temperature both below and above the superfluid transition. The universal character of the equation of state for dilute systems and low temperatures is investigated by modeling the interatomic interactions using different repulsive potentials corresponding to the same s-wave scattering length. The results obtained for the energy and the pressure are compared to the virial expansion for temperatures larger than the critical temperature. At very low temperatures we find agreement with the ground-state energy calculated using the diffusion Monte Carlo method.

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