Quantum Fields and Dissipation
High Energy Physics - Phenomenology
2015-06-25 v1
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.
Cite
@article{arxiv.hep-ph/9605438,
title = {Quantum Fields and Dissipation},
author = {P. A. Henning},
journal= {arXiv preprint arXiv:hep-ph/9605438},
year = {2015}
}
Comments
Paper in ReVTeX, 12 pages. Figures and complete paper available via anonymous ftp at ftp://tpri6c.gsi.de/pub/phenning/h96neq, contribution to the Umezawa memorial volume of Physics Essays