Transition from weak to strong coupling in QCD and in grand unified models at high temperature

Joseph Kapusta, David B. Reiss, Serge Rudaz

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

We investigate the weak-coupling expansion at high temperature for relativistic quantum field theories. Boson self-energies generally acquire a non-analytic dependence on the coupling due to the infrared plasmon effect. We show how to sum loops within loops for such thermodynamic quantities as pressure and energy density. Recent high-precision Monte Carlo simulations of quarkless SU(3) gauge theory are compared to the weak-coupling expansion and an excellent agreement is obtained for the high-temperature phase. Weak-coupling calculations are also carried out for supersymmetric grand unified models. We find indications that such models are often strongly coupled already at the unification temperature. This may have a significant effect on models of the early universe.

Original languageEnglish (US)
Pages (from-to)207-227
Number of pages21
JournalNuclear Physics, Section B
Volume263
Issue number1
DOIs
StatePublished - Jan 13 1986

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