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• W1969873321 abstract "The formulation of path-integral centroid dynamics is extended to the quantum dynamics of density operators evolving from general initial states by means of the nonequilibrium projection operator technique. It is shown that the new formulation provides a basis for applying the method of centroid dynamics to nonequilibrium situations and that it allows the derivation of new formal relations, which can be useful in improving current equilibrium centroid dynamics methods. A simple approximation of uniform relaxation for the unprojected portion of the Liouville space propagator leads to a class of practically solvable equations of motion for the centroid variables, but with an undetermined parameter of relaxation. This new class of equations encompasses the centroid molecular-dynamics (CMD) method as a limiting case, and can be applied to both equilibrium and nonequilibrium situations. Tests for the equilibrium dynamics of one-dimensional model systems demonstrate that the new equations with appropriate choice of the relaxation parameter are comparable to the CMD method." @default.
• W1969873321 created "2016-06-24" @default.
• W1969873321 creator A5091898071 @default.
• W1969873321 date "2006-02-10" @default.
• W1969873321 modified "2023-10-16" @default.
• W1969873321 title "Path-integral centroid dynamics for general initial conditions: A nonequilibrium projection operator formulation" @default.
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• W1969873321 doi "https://doi.org/10.1063/1.2162887" @default.
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• W1969873321 hasPublicationYear "2006" @default.
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