Two mechanisms for the elimination of pinch singularities in out of equilibrium thermal field theories

Details Two mechanisms for the elimination of pinch singularities in out of equilibrium thermal field theories Two mechanisms for the elimination of pinch singularities in out of equilibrium thermal field theories

1998-01-23

arxiv.org/abs/hep-ph/9801399v2

Phys.Rev.D59:125012,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

24 pages, Latex, no figures, revised version, many minor changes and corrections

Scientific paper

10.1103/PhysRevD.59.125012

We analyze ill-defined pinch singularities characteristic of out of equilibrium thermal field theories. We identify two mechanisms that eliminate pinching even at the single self-energy insertion approximation to the propagator: the first is based on the vanishing of phase space at the singular point (threshold effect). It is effective in QED with a massive electron and a massless photon. In massless QCD, this mechanism fails, but the pinches cancel owing to the second mechanism, i.e., owing to the spinor/tensor structure of the single self-energy insertion contribution to the propagator. The constraints imposed on distribution functions are very reasonable.

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