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arXiv · hep-ph/9605438

Quantum Fields and Dissipation

P. A. Henning
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Abstract

The description of thermal or non-equilibrium systems necessitates a quantum field theory which differs from the usual approach in two aspects: 1.The Hilbert space is doubled; 2.Stable quasi-particles do not exist in interacting systems. A mini-review of these two aspects is given from a practical viewpoint including two applications. For thermal states it is shown how infrared divergences occuring in perturbative quasi-particle theories are avoided, whereas for non-equilibrium states a memory effect is shown to arise in the thermalization.

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P. A. Henning. 1996-05-30. Quantum Fields and Dissipation. https://doi.org/10.4006/1.3029272

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