Bonn 2010 – wissenschaftliches Programm
HK 14.1: Gruppenbericht
Dienstag, 16. März 2010, 14:00–14:30, HG I
An effective chiral Hadron-Quark Equation of State — •Jan Steinheimer-Froschauer1, Stefan Schramm1,2, and Horst Stöcker1,2,3 — 1Institut für Theoretische Physik, Goethe Uni Frankfurt — 2Frankfurt Institute for Advanced Studies, Frankfurt — 3GSI, Hlemholzzentrum für Schwerionenphysik, Darmstadt
We construct an effective model for the QCD equation of state, taking into account chiral symmetry restoration as well as the deconfinement phase transition. The correct asymptotic degrees of freedom at the high and low temperature limits are included (quarks ↔ hadrons). The model shows a rapid crossover for both order parameters, as is expected from lattice calculations. All thermodynamic quantities at µB=0 are in qualitative agreement with lattice data, while apparent quantitative differences can be attributed to hadronic contributions and excluded volume corrections. We then investigate the phase diagramm and thermodynamic properties of the model at finite baryon densities, where it reveals an interesting phase where chiral symmetry is partially restored but deconfinement not realised.