A Deduced Feynman Rule for Calculating Retarded and Advanced Green function in Closed Time Path Formalism

2002/04/01 by Jun Xiao, Xiao, Jun, Enke Wang +1
Computer Science · Engineering · Physics and Astronomy · #Computational Physics and Python Applications #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Photonic and Optical Devices #hep-ph

paper · pdf · doi:10.48550/arxiv.hep-ph/0204009

Text and formula are revised

openalex publication_date 2002/04/01 · arxiv created 2002/05/21 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Based on the closed time path formalism, a new Feynman rule for directly calculating the retarded and advanced Green functions is deduced. This Feynman rule is used to calculate the two-point self-energy and three-point vertex correction in ϕ³ theory. The generalized fluctuation-dissipation theorem for three-point nonlinear response function is verified.

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