Diffusion processes, quantum dynamical semigroups, and the classical KMS condition

Abstract
We study some properties of the generator of a diffusion process describing the reduced dynamics of a classical system weakly coupled to an external reservoir. We show that such processes may be equivalently obtained as classical limits of quantum dynamical semigroups derived in the weak coupling limit. We prove that the stationary state is independent of the coupling if and only if the reservoir is in a state of thermal equilibrium.

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