1996/09/02 by Edmond Iancu, Iancu, Edmond, Service de Physique Theorique +3
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Pulsars and Gravitational Waves Research #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9609225
7 pages, LaTeX, Invited talk at the Workshop on Quantum Chromodynamics, 3-8 June, 1996, American University of Paris, France
arxiv created 1996/09/02 · openalex publication_date 1996/09/02 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The study of the ultrarelativistic plasmas in perturbation theory is plagued with infrared divergences which are not eliminated by the screening corrections. They affect, in particular, the computation of the lifetime of the elementary excitations, thus casting doubt on the validity of the quasiparticle picture. We show that, for Abelian plasmas at least, the infrared problem of the damping rate can be solved by a non-perturbative treatment based on the Bloch-Nordsieck approximation. The resulting expression of the fermion propagator is free of divergences, and exhibits a \it non-exponential damping at large times: SR(t)∼ exp\-αT t lnωpt\, where ωp=gT/3 is the plasma frequency and α=g2/4π.