Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-09-14
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages twocolumn REVTeX, 2 eps figures, minor corrections
Scientific paper
The extrapolation of truncated perturbative series to the large coupling regime is not reliable since the accuracy of the calculations cannot be improved systematically by a finite set of higher order terms. Instead, a nonperturbative approach is proposed here to describe the thermodynamics of strongly coupled plasmas. Within the $\phi^4$ theory, it is derived from the Luttinger-Ward theorem and amounts to a quasiparticle description. The approach is extended to the quark-gluon plasma. Even close to the confinement temperature it is found to be in a good agreement with lattice data of several gauge systems. The model is applied to predict the equation of state of the quark-gluon plasma with realistic quark masses.
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