Abstract
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. The same mechanism eliminates pinching from the resummed Schwinger-Dyson series.
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© 1999 Springer-Verlag
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Dadić, I. (1999). Out of equilibrium thermal field theories — Elimination of pinching singularities. In: Cleymans, J., Geyer, H.B., Scholtz, F.G. (eds) Hadrons in Dense Matter and Hadrosynthesis. Lecture Notes in Physics, vol 516. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0107315
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DOI: https://doi.org/10.1007/BFb0107315
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