Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-11-19
Prog.Theor.Phys. 111 (2004) 105-122
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTeX2e, 20 pages
Scientific paper
10.1143/PTP.111.105
Using the closed-time-path formalism, we construct perturbative frameworks, in terms of quasiparticle picture, for studying quasiuniform relativistic quantum field systems near equilibrium and non-equilibrium quasistationary systems. We employ the derivative expansion and take in up to the second-order term, i.e., one-order higher than the gradient approximation. After constructing self-energy resummed propagator, we formulated two kind of mutually equivalent perturbative frameworks: The first one is formulated on the basis of the ``bare'' number density function, and the second one is formulated on the basis of ``physical'' number density function. In the course of construction of the second framework, the generalized Boltzmann equations directly come out, which describe the evolution of the system.
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