TY  - EJOUR
AU  - Steinheimer, J
AU  - Schramm, S
AU  - Stöcker, Horst
TI  - An effective chiral hadron–quark equation of state
JO  - Journal of physics / G
VL  - 38
IS  - 3
SN  - 0305-4616
CY  - Bristol
PB  - IOP Publ.
M1  - GSI-2013-00020
SP  - 035001 -
PY  - 2011
N1  - 19 pages, 13 figures Version accepted by J. Phys. G
AB  - 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 leftrightarrow hadrons). The model shows a rapid crossover for both order parameters, as is expected from lattice calculations. We then compare the thermodynamic properties of the model at mu<sub>B</sub>=0 which turn out to be in qualitative agreement with lattice data, while apparent quantitative differences can be attributed to hadronic contributions and excluded volume corrections. Furthermore we discuss the effects of a repulsive vector type quark interaction at finite baryon number densities on the resulting phase diagram of the model. Our current model is able to reproduce a first-order liquid gas phase transition as expected, but does not show any signs of a first order deconfinement or chiral phase transition. Both transitions rather appear as a very wide crossover in which heavily medium modified hadron coexist with free quarks.
LB  - PUB:(DE-HGF)25
DO  - DOI:10.1088/0954-3899/38/3/035001
UR  - https://repository.gsi.de/record/46041
ER  -