Fermions at high temperature

G. Gatoff, J. Kapusta

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

We calculate the self-energy of massless fermions interacting with massless bosons at high temperature by summing the set of ring diagrams. This leads to an effective one-loop equation. We further approximate the boson self-energy by a temperature-dependent mass squared which is of order (gT)2. At low momenta, p<g2T, the fermion dispersion relation is =(1/3p, whereas for high momenta, p>gT, it is =p. In the intermediate region, g2T<p<gT, the fermion oscillations are overdamped and do not propagate. We speculate that this may be due to spatial inhomogeneities caused by the formation of resonant or coherent states of bosons and fermions, which have a characteristic size of 1/gT and a characteristic separation of 1/g2T.

Original languageEnglish (US)
Pages (from-to)611-621
Number of pages11
JournalPhysical Review D
Volume41
Issue number2
DOIs
StatePublished - Jan 1 1990

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