Problems of Perturbation Series in Non-Equilibrium Quantum Field Theories
arXiv:hep-ph/9405396 · doi:10.1016/0370-2693(94)91021-9
Abstract
In the standard framework of non-equilibrium quantum field theories, the pinch singularities associated to multiple products of -functions do not cancel in a perturbative expansion unless the particle distributions are those for a system in thermal and chemical equilibrium.
10 pages, 2 figures, Cern preprint CERN-TH.7271/94
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