Thermodynamic Properties of a Simple, Connning Model
نویسنده
چکیده
We study the equilibrium thermodynamics of a simple, connning, DSE-model of 2-avour QCD at nite temperature and chemical potential. The model has two phases: one characterised by connnement and dynamical chiral symmetry breaking; and the other by their absence. The phase boundary is deened by the zero of the vacuum-pressure diierence between the connned and deconnned phases. Chiral symmetry restoration and deconnnement are coincident with the transition being of rst order, except for = 0, where it is second order. Nonperturbative modiications of the dressed-quark propagator persist into the deconnned domain and lead to a dispersion law modiied by a dynamically-generated, momentum-dependent mass-scale. This entails that the Stefan-Boltzmann limit for the bulk thermodynamic quantities is attained only for large values of temperature and chemical potential. The existence of a \quark-gluon plasma" QGP] phase of QCD is well established. It is characterised by deconnnement, which means that quarks and gluons have mean free paths that are long in comparison with standard nuclear radii, and the realisation of chiral symmetry in the Wigner mode; i.e., all chiral symmetry breaking eeects require an explicit source: the current-quark mass. However, the details of the transition to this phase, and the thermody
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تاریخ انتشار 2007