The Feynman‐Vernon, Caldeira‐Leggett model for a quantum dissipative system is used, via a general kinetic equation due to Chow, Browne, and the present author, to cast light on the classical limit of quantum Brownian motion, with special attention paid to the requirement of coarse graining in time.
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Vinay Ambegaokar (1991) studied this question.
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