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- W2068647558 abstract "The method of projection operators, which plays an important role in the field of nonequilibrium statistical mechanics, has been established with the use of the Liouville--von Neumann equation for a density matrix to eliminate irrelevant information from a whole system. We formulate a unified and general projection operator method for dynamical variables. The main features of our formalism parallel those for the Liouville--von Neumann equation. (1) Two types of basic equations, time-convolution and time-convolutionless decompositions, are systematically obtained without specifying a projection operator. (2) Expansion formulas for both decompositions are also obtained. (3) Problems incorporating a time-dependent Liouville operator can be flexibly treated. We apply the formulas to problems in random frequency modulation and low field resonance. In conclusion, our formalism yields a more direct and easier means of determining the average time evolution of an operator than the one for the Liouville--von Neumann equation." @default.
- W2068647558 created "2016-06-24" @default.
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- W2068647558 date "1999-09-01" @default.
- W2068647558 modified "2023-09-27" @default.
- W2068647558 title "Unified projection operator formalism in nonequilibrium statistical mechanics" @default.
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- W2068647558 doi "https://doi.org/10.1103/physreve.60.2636" @default.
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