Derivation of Transport Equations using the Time-Dependent Projection Operator Method

Details Derivation of Transport Equations using the Time-Dependent Projection Operator Method Derivation of Transport Equations using the Time-Dependent Projection Operator Method

2001-10-24

arxiv.org/abs/hep-th/0110224v2

Prog.Theor.Phys.107:525-541,2002

Physics

High Energy Physics

High Energy Physics - Theory

17 pages, Prog. Theor. Phys. in Press

Scientific paper

10.1143/PTP.107.525

We develop a formalism to carry out coarse-grainings in quantum field theoretical systems by using a time-dependent projection operator in the Heisenberg picture. A systematic perturbative expansion with respect to the interaction part of the Hamiltonian is given, and a Langevin-type equation without a time-convolution integral term is obtained. This method is applied to a quantum field theoretical model, and coupled transport equations are derived.

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