The Barton Expansion and the Path Integral Approach in Thermal Field Theory

Details The Barton Expansion and the Path Integral Approach in Thermal Field Theory The Barton Expansion and the Path Integral Approach in Thermal Field Theory

1996-02-09

arxiv.org/abs/hep-th/9602050v1

Phys.Rev. D54 (1996) 6435-6443

Physics

High Energy Physics

High Energy Physics - Theory

16 pages, ReVTeX

Scientific paper

10.1103/PhysRevD.54.6435

It has been shown how on-shell forward scattering amplitudes (the ``Barton expansion'') and quantum mechanical path integral (QMPI) can both be used to compute temperature dependent effects in thermal field theory. We demonstrate the equivalence of these two approaches and then apply the QMPI to compute the high temperature expansion for the four-point function in QED, obtaining results consistent with those previously obtained from the Barton expansion.

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