Condensed Matter Physics, 2006, vol. 9, No. 3(47), p. 473-484, English

Title: Extended quasiparticle approximation for relativistic electrons in plasmas
  V.G.Morozov (Moscow State Institute of Radioengineering, Electronics and Automation, 117454\ Vernadsky Prospect 78, Moscow, Russia) ,
  G.Röpke (Department of Physics, Rostock University, 18051 Rostock, Germany)

Starting with Dyson equations for the path-ordered Green's function, it is shown that the correlation functions for relativistic electrons (positrons) in a weakly coupled non-equilibrium plasmas can be decomposed into sharply peaked quasiparticle parts and off-shell parts in a rather general form. To leading order in the electromagnetic coupling constant, this decomposition yields the extended quasiparticle approximation for the correlation functions, which can be used for the first principle calculation of the radiation scattering rates in QED plasmas.

Key words: Many-particle QED, nonequilibrium Green's functions, kinetic theory of relativistic plasmas
PACS: 05.30.-d, 52.25.Dg, 52.27.-h, 52.27.Ny

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