Prog. Theor. Phys. Vol. 102 No. 1 (1999) pp. 1-27

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Out of Equilibrium Quantum Field Theory

— Perturbation Theory and Generalized Boltzmann Equation —

Akira Niégawa^*)

Department of Physics, Osaka City University, Osaka 558-8585, Japan

(Received January 10, 1999)

Abstract:

This paper describes a perturbative framework, on the basis of the closed-time-path formalism, in terms of the quasiparticle picture for studying quasi-uniform relativistic quantum field systems near equilibrium and nonequilibrium quasistationary systems. Two calculational schemes are introduced, one is formulated on the basis of the initial-particle distribution function, and the other is formulated on the basis of the \lq\lqphysical”-particle distribution function. It is shown that the two schemes are equivalent and lead to a generalized kinetic or Boltzmann equation. A concrete procedure for computing a generic amplitude is presented.

URL : http://ptp.ipap.jp/link?PTP/102/1/
DOI : 10.1143/PTP.102.1

^*)E-mail: niegawa@sci.osaka-cu.ac.jp

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Citing Article(s) :

Progress of Theoretical Physics Vol. 111 No. 1 (2004) pp. 105-122 :
Perturbative Out of Equilibrium Quantum Field Theory beyond the Gradient Approximation and Generalized Boltzmann Equation

Hideaki Ozaki