Kinetic equations within the formalism of non-equilibrium thermo field dynamics |
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Affiliation: | Institute of Physics, University of Tsukuba, Ibaraki 305, Japan;Iran University of Science and Technology, University St., Hengam St., Tehran, Iran |
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Abstract: | After reviewing the real-time formalism of dissipative quantum field theory, i.e. non-equilibrium thermo field dynamics (NETFD), a kinetic equation, a self-consistent equation for the dissipation coefficient and a “mass” or “chemical potential” renormalization equation for non-equilibrium transient situations are extracted out of the two-point Green's function of the Heisenberg field, in their most general forms upon the basic requirements of NETFD. The formulation is applied to the electron-phonon system, as an example, where the gradient expansion and the quasi-particle approximation are performed. The formalism of NETFD is reinvestigated in connection with the kinetic equations. |
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