Problems of Perturbation Series in Non-Equilibrium Quantum Field Theories

Details Problems of Perturbation Series in Non-Equilibrium Quantum Field Theories Problems of Perturbation Series in Non-Equilibrium Quantum Field Theories

1994-05-27

arxiv.org/abs/hep-ph/9405396v1

Phys.Lett. B333 (1994) 149-152

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 2 figures, Cern preprint CERN-TH.7271/94

Scientific paper

10.1016/0370-2693(94)91021-9

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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