Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 21: Schwerionenkollisionen und QCD Phasen
HK 21.8: Vortrag
Dienstag, 20. März 2012, 18:30–18:45, P 5
Critical point in the QCD phase diagram: effects of vector interaction and axial U(1) anomaly at finite chemical potential — •Nino Bratovic1,2, Wolfram Weise1, and Tetsuo Hatsuda2 — 1Institut für Theoretische Physik T39, Physik-Department der TU München, James-Franck-Straße 1, 85747 Garching, Deutschland — 2Quantum Hadron Physics Laboratory, RIKEN, Wako-shi, Saitama-ken, Japan
The Nambu-Jona-Lasinio model extended by Polyakov-loop dynamics (PNJL model) for 2 + 1 flavors is used in order to study the QCD phase diagram and associated thermodynamic quantities. In this approach, spontaneous chiral symmetry breaking as well as color singlet suppression in the hadronic phase are realized dynamically in terms of the respective order parameters. We investigate in detail the effects of a vector-type interaction in this model, particularly in combination with the U(1)A symmetry breaking Kobayashi-Maskawa-*t Hooft interaction. We show phase diagrams in the temperature-density plane and discuss possible constraints on the model from our knowledge of nuclear physics. The question of the existence and possible locations of the critical point within our framework is discussed as well.
Work supported in part by BMBF, GSI and the DFG Excellence Cluster "Origin and Structure of the Universe".