Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-09-27
J.Phys.G38:035001,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages, 13 figures Version accepted by J. Phys. G
Scientific paper
10.1088/0954-3899/38/3/035001
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 $\mu_B=0$ 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.
Schramm Stefan
Steinheimer Jan
Stocker Horst
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