Thermodynamic Properties of Non-Equilibrium States in Quantum Field Theory

Details Thermodynamic Properties of Non-Equilibrium States in Quantum Field Theory Thermodynamic Properties of Non-Equilibrium States in Quantum Field Theory

2001-05-06

arxiv.org/abs/hep-ph/0105051v2

Annals Phys. 297 (2002) 219-242

Physics

High Energy Physics

High Energy Physics - Phenomenology

29 pages, minor changes, reference added; version as to appear in Annals of Physics

Scientific paper

Within the framework of relativistic quantum field theory, a novel method is established which allows to distinguish non-equilibrium states admitting locally a thermodynamic interpretation. The basic idea is to compare these states with global equilibrium states (KMS states) by means of local thermal observables. With the help of such observables, the states can be ordered into classes of increasing local thermal stability. Moreover, it is possible to identify states exhibiting certain specific thermal properties of interest, such as a definite local temperature or entropy density. The method is illustrated in a simple model describing the spatio-temporal evolution of a ``big heat bang''.

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