Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-07-12
Phys.Rev. D62 (2000) 105032
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages; no figures; submitted to Phys. Rev. D
Scientific paper
10.1103/PhysRevD.62.105032
A partial resummation of perturbation theory is described for field theories containing spin-1/2 particles in states that may be far from thermal equilibrium. This allows the nonequilibrium state to be characterized in terms of quasiparticles that approximate its true elementary excitations. In particular, the quasiparticles have dispersion relations that differ from those of free particles, finite thermal widths and occupation numbers which, in contrast to those of standard perturbation theory evolve with the changing nonequilibrium environment. A description of this kind is essential for estimating the evolution of the system over extended periods of time. In contrast to the corresponding description of scalar particles, the structure of nonequilibrium fermion propagators exhibits features which have no counterpart in the equilibrium theory.
Lawrie Ian D.
McKernan D. B.
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