Microcanonical determination of effective-spin models for finite-temperature QCD

The microcanonical-reorganization-group techniques developed by Creutz, et al. (1984) are applied to computer-simulation effective-spin models for finite-temperature QCD in SU(3) gauge theory. The effective-spin-model coupling coefficient J is plotted against the gauge-field coupling coefficient lambda; the results are compared with the predictions of strong-coupling (Green and Karsch, 1984) and weak-coupling (Kadanoff, 1977) theory; and the implications of the transition to a new phase of deconfined quarks and gluons for cosmology are indicated.