TY - INPR
A1 - Plimak, L. I.
A1 - Fleischhauer, M.
A1 - Walls, D. F.
T1 - Thermal Properties of Interacting Bose Fields and Imaginary-Time Stochastic Differential Equations
N2 - Abstract: Matsubara Green's functions for interacting bosons are expressed as classical statistical averages corresponding to a linear imaginary-time stochastic differential equation. This makes direct numerical simulations applicable to the study of equilibrium quantum properties of bosons in the non-perturbative regime. To verify our results we discuss an oscillator with quartic anharmonicity as a prototype model for an interacting Bose gas. An analytic expression for the characteristic function in a thermal state is derived and a Higgs-type phase transition discussed, which occurs when the oscillator frequency becomes negative.
Y1 - 1998
UR - https://kluedo.ub.uni-kl.de/frontdoor/index/index/docId/1305
UR - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:386-kluedo-12141
ER -