Problems of Perturbation Series in Non-Equilibrium Quantum Field Theories
classification
✦ hep-ph
keywords
fieldnon-equilibriumquantumtheoriesassociatedcancelchemicaldelta
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In the standard framework of non-equilibrium quantum field theories, the pinch singularities associated to multiple products of $\delta$-functions do not cancel in a perturbative expansion unless the particle distributions are those for a system in thermal and chemical equilibrium.
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