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• W1980633593 abstract "The phase space formulation of quantum statistical mechanics using the Feynman path centroid density offers an alternative perspective to the standard Wigner prescription for the classical-like evaluation of equilibrium and/or dynamical quantities of statistical systems. The use of this formulation has been implicit in recent work on quantum rate theories, for example, in which the centroid density distribution replaces the classical Boltzmann distribution. In order to further understand the approximations involved in this and similar transcriptions, the present work elaborates and clarifies the issue of operator ordering in a rigorous centroid-based formulation. In particular, through the use of the Weyl correspondence, a precise definition of the centroid symbol of operators and their products is presented. Though we fall short of finding the algebraic structure tantamount to that found in the Weyl symbols—of which the Wigner distribution is an example— the resulting expressions have internal consistency and are amenable to approximate evaluation through cumulant expansions." @default.
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• W1980633593 date "1995-09-22" @default.
• W1980633593 modified "2023-10-17" @default.
• W1980633593 title "On the Feynman path centroid density as a phase space distribution in quantum statistical mechanics" @default.
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• W1980633593 doi "https://doi.org/10.1063/1.470588" @default.
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