Damping Rate of a Fermion in a Medium

Abstract

We examine the relation between the damping rate of a massless, chiral fermion that propagates in a medium, and the rate $\Gamma$ of approach to equilibrium. It is proven that these quantities are equal, by showing that they are given by the same formula in terms of the imaginary part of the self-energy evaluated at the energy of the propagating fermion mode. This result is valid provided $\Gamma$ is defined by using the appropriate wave functions of the mode.

Version to appear in Phys. Rev. D

References in corpus (2)

• Comment on ``High Temperature Fermion Propagator -- Resummation and Gauge Dependence of the Damping Rate''
• Introduction to Thermal Field Theory

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