Quantum Fields and Dissipation

Details Quantum Fields and Dissipation Quantum Fields and Dissipation

1996-05-30

arxiv.org/abs/hep-ph/9605438v1

Phys.Essays 9:569-575,1996

Physics

High Energy Physics

High Energy Physics - Phenomenology

Paper in ReVTeX, 12 pages. Figures and complete paper available via anonymous ftp at ftp://tpri6c.gsi.de/pub/phenning/h96neq,

Scientific paper

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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