S-matrix representation of the finite temperature propagator in λϕ⁴-QFT

1995/07/20 by A. I. Bugrij, Bugrij, A. I., L. L. Jenkovszky +3
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Theory (hep-th) #hep-th

paper · pdf · doi:10.48550/arxiv.hep-th/9507101

9 pages

arxiv created 1995/07/20 · arxiv updated 2009/11/30

Abstract

The two-point Green function of the massive scalar (3+1)-quantum field theory with λϕ⁴ interaction at finite temperature is evaluated up to the 2nd order of perturbation theory. The averaging on the vacuum fluctuations is separated from the averaging on the thermal fluctuations explicitly. As a result, the temperature dependent part of the propagator is expressed through the scattering amplitudes. The obtained expression is generalized for higher orders of perturbation theory.

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