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Variational path-integral approach to a nonlinear open system
Phys. Rev. E 52, 5656 – Published 1 November, 1995
DOI: https://doi.org/10.1103/PhysRevE.52.5656
Abstract
The variational path-integral method is used to calculate the partition function with an effective potential of a nonlinear open system, which is described by the system-plus-environment model. The two variational parameters corresponding to the potential and the coupling form factor, respectively, in the quadratic trial action are determined by minimizing the effective potential. A general expression for the partition function at finite temperature is obtained.
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