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[en] A derivation of the closed-time path formalism of quantum field theory is given at finite temperatures. The derivation is based on a solution found for the diagonal element of the closed-time path transition amplitudes at zero temperatures, the performance of an averaging over the temperature-dependent statistical distribution and finally the application of the action principle for a closed-time path. (author)
Journal
Journal of Physics. G, Nuclear and Particle Physics; ISSN 0954-3899; 
; CODEN JPGPE; v. 17(11); p. L173-L175
; CODEN JPGPE; v. 17(11); p. L173-L175