MG14 - Talk detail

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Abstract

First-order phase transitions (PTs) with more than one globally conserved charge, so-called noncongruent PTs, have characteristic differences compared to congruent PTs (e.g., dimensionality of phase diagrams and location and properties of critical points and end points). In this talk we investigate the noncongruence of the QCD or deconfinement PT and compare it with the nuclear liquid-gas PT. For the equation of state we use the chiral SU(3) model. It is one of the few models which contains quarks and hadrons in arbitrary proportions (i.e., a “solution”) and gives a continuous transition from pure hadronic to pure quark matter above a critical point. The study shows the universality of the applied concept of noncongruence for the two PTs and illustrates the different typical scales involved. In addition, we find a principle difference between the liquid-gas and the QCD PT: in contrast to the ordinary Van-der-Waals-like PT, the phase coexistence line of the QCD PT has a negative slope in the pressure-temperature plane. As another qualitative difference we find that the noncongruent features of the QCD PT become vanishingly small around the critical point.

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