Münster 2011 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 49: Schwerionenkollisionen und QCD Phasen VI
HK 49.1: Gruppenbericht
Donnerstag, 24. März 2011, 14:00–14:30, HS AP
Quark Hadron Matter in a Unified Approach — •Philip Rau1, Jan Steinheimer1, Stefan Schramm1,2, and Horst Stoecker1,2,3 — 1Institut für Theoretische Physik, Goethe-Universität Frankfurt — 2Frankfurt Institute for Advanced Studies (FIAS), Frankfurt — 3GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt
We present an effective model for the QCD EoS, taking into account
chiral symmetry restoration as well as the deconfinement phase
transition. For the hadronic part we apply a SUf(3) parity
doublet model with quarks introduced in anology to the PNJL model. The
correct asymptotic degrees of freedom at the high and low temperature
limits are included (quarks ↔ hadrons). As expected
from lattice calculations, the model shows a rapid crossover for both
order parameters at µB=0. We compare thermodynamic properties of
the model at µB=0 which are in qualitative agreement with lattice
data, while apparent quantitative differences can be attributed to
hadronic contributions. Our model reproduces a first-order liquid gas
phase transition as expected, and exhibits another first order chiral
phase transition at high densities terminated by a critical
endpoint. The deconfinement transition appears as a very wide
crossover in which heavily medium modified
hadrons coexist with free quarks.
Furthermore,the full baryonic resonance spectrum is implemented and we
study the impact of a varying vector coupling strength on the phase
diagram, i.e. the location of the phase transition and the existence
of a critical point. We present quark number susceptibilities and
compare them to lattice results.