Heidelberg 2015 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 65: Heavy Ion Collisions and QCD Phases 9
HK 65.5: Vortrag
Donnerstag, 26. März 2015, 18:00–18:15, T/SR14
The magnetic equation of state in effective chiral models — •Gabor Almasi1, Wojciech Tarnowski1,4, Bengt Friman1, and Krzysztof Redlich2,3 — 1Helmholtzzentrum für Schwerionenforschung (GSI), 64291 Darmstadt, Germany — 2University of Wrocław - Faculty of Physics and Astronomy, PL-50-204 Wroclaw, Poland — 3Helmholtzzentrum für Schwerionenforschung (GSI) - ExtreMe Matter Institute (EMMI), 64291 Darmstadt, Germany — 4Jagiellonian University, PL-30-059 Cracow, Poland
The chiral properties of QCD are often studied using effective models like the Quark-Meson model. In these models the gauge sector of QCD is integrated out and the models do not show confinement, but they are significantly easier to deal with. Concerning chiral properties they are constructed to be in the same universality class as QCD, so sufficiently close to the chiral phase transition they have the same universal properties (e.g. critical exponents). A finite current quark mass however breaks chiral symmetry explicitly rendering it an approximate symmetry both in QCD and in effective models. This causes violation of the scaling laws at the chiral phase transition. The measure of the violation in QCD and the effective model is in general different. However the better the model is, the closer the deviations from the scaling should be to the deviations in QCD. In this talk the scaling violations in effective models of QCD will be discussed and the results will be compared with lattice data on the magnetic equation of state.