Noncongruence of the deconfinement phase transition

20 May 2014, 16:30
2h
spectrum (darmstadtium)

spectrum

darmstadtium

Board: B-06
Poster QCD Phase Diagram Poster session

Speaker

Matthias Hempel (Basel University)

Description

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 deconfinement PT and compare it with the nuclear liquid-gas PT at subsaturation densities. The used equation of state is calculated from the chiral SU(3) model, which is one of the few models for the deconfinement PT, 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 deconfinement PTs: in contrast to the ordinary Van-der-Waals-like PT, the phase coexistence line of the deconfinement PT has a negative slope in the pressure-temperature plane. As another qualitative difference we find that the noncongruent features of the deconfinement PT become vanishingly small around the critical point.

Primary author

Matthias Hempel (Basel University)

Co-authors

Prof. Igor Iosilevskiy (Joint Institute for High Temperature of RAS, Moscow, Russia and Moscow Institute of Physics and Technology (State University)) Stefan Schramm Veronica Dexheimer (Kent State University)

Presentation Materials