ENTROPY AND BARYON NUMBER CONSERVATION IN THE DECONFINEMENT PHASE-TRANSITION

The conservation of entropy and baryon number in the deconfinement pha se transition is studied in the framework of the bag model. In the sta ndard construction of the equilibrium phase transition from a quark-gl uon plasma into a hadron gas a subsequent dilution and reheating of th e system on the phase boundary is necessary to preserve the entropy an d baryon number conservation. We propose modifying the bag pressure to depend explicitly on temperature and baryon chemical potential. It is shown that this modification is sufficient to construct a model in ag reement with the Gibbs equilibrium criteria for a phase transition, wh ile simultaneously assuring entropy and baryon number conservation on the phase boundary. Within this model the quark-gluon plasma hadronize s at a fixed temperature and chemical potential.