Three-Point Functions at Finite Temperature

Abstract

We study 3-point functions at finite temperature in the closed time path formalism. We give a general decomposition of the eight component tensor in terms of seven vertex functions. We derive a spectral representation for these seven functions in terms of two independent real spectral functions. We derive relationships between the seven functions and obtain a representation of the vertex tensor that greatly simplifies calculations in real time.

Comments: 21 pages LaTeX; one ps-figure; Revised version, contains more references and discussion