Thursday, July 11, 2013

1307.2851 (Rainer Stiele et al.)

Thermodynamics of (2+1)-flavor strongly interacting matter at nonzero

Rainer Stiele, Eduardo S. Fraga, Juergen Schaffner-Bielich
We investigate the phase structure of strongly interacting matter at non-vanishing isospin before the onset of pion condensation in the framework of the Polyakov-Quark-Meson model with 2+1 quark flavors. We find a decrease of the pseudo-critical temperature with the isospin chemical potential qualitatively in line with recent lattice data for two flavors. The impact of the pion mass on the curvature of the phase transition line is also discussed. We show results for all relevant thermodynamic quantities. In particular, we obtain a moderate change of the pressure with isospin at vanishing baryon chemical potential, whereas the chiral condensate decreases more appreciably. The three-dimensional (T-mu_quark-mu_isospin) phase diagram exhibits a small first-order surface for large mu_quark and small mu_isospin.
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