A simple out-of-equilibrium field theory formalism ?

Details A simple out-of-equilibrium field theory formalism ? A simple out-of-equilibrium field theory formalism ?

2001-04-06

arxiv.org/abs/hep-ph/0104075v1

Phys.Rev. D64 (2001) 056006

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex, 5 pages, no figures

Scientific paper

10.1103/PhysRevD.64.056006

In this paper, we determine a condition of applicability of a very simple formalism for the calculation of a fast process taking place in a non-equilibrium medium, in which the particle distribution functions are frozen in time. Indeed, a well known obstacle for the use of such a naive formalism is the appearance of the so-called ``pinch singularities''. We argue that these potentially dangerous terms can be regularized, and that they are negligible if the characteristic time-scale of the process under study is small compared to the relaxation time of the system.

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