Constrained effective potential in hot QCD
arXiv:hep-th/9310195 · doi:10.1016/0550-3213(94)90081-7
Abstract
Constrained effective potentials in hot gauge theory give the probability that a configuration p of the order parameter (Polyakov loop) occurs. They are important in the analysis of surface effects and bubble formation in the plasma. The vector potential appears non-linearly in the loop; in weak coupling the linear term gives rise to the traditional free energy graphs. But the non-linear terms generate insertions of the constrained modes into the free energy graphs, through renormalisations of the Polyakov loop. These insertions are gauge dependent and are necessary to cancel the gauge dependence of the free energy graphs. The latter is shown, through the BRST identities, to have again the form of constrained mode insertions. It also follows, that absolute minima of the potential are at the centergroup values of the loop. We evaluate the two-loop contributions for SU(N) gauge theories, with and without quarks, for the full domain of the N-1 variables.
Altes,39 pages, CPT/P2991, 1 tex file, 6 figures in ps format. This version contains corrections of mostly cosmetic nature. The results are unchanged. v3 includes properly the figures
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