Abstract:Année de publication : 1997
We compute the damping rates of one--particle excitations in a cold ultrarelativistic plasma to leading order in the coupling constant $e$ for three types of interaction: Yukawa coupling to a massless scalar boson, QED and QCD. Damping rates are of order $e^3\mu$, $e^4\mu$ or $e^4\mu\log(1/e)$. In particular, we find that the damping rate of an electron or of a quark is constant far from the Fermi surface, while it decreases linearly with the excitation energy close to the Fermi surface due to the long--range magnetic interaction.
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