Münster 2011 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 2: Schwerionenkollisionen und QCD Phasen I
HK 2.3: Vortrag
Montag, 21. März 2011, 15:00–15:15, HS AP
(contribution withdrawn) Multiple Critical Points in Effective Quark Models — •Lorenzo Ferroni1, Volker Koch2, and Marcus Pinto3 — 1Institut für Theoretische Physik, Goethe-Universität, Frankfurt, Germany — 2Lawrence Berkeley National Laboratory, Berkeley, CA (USA) — 3Departamento de Fisica, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, Brazil
We consider the two flavor version of the Linear Sigma Model as well as of the Nambu Jona-Lasinio model, at finite temperature and quark chemical potential, beyond the Mean Field Approximation. Using parameter values for the pion and quark current masses which weakly break chiral symmetry we show that both models can present more than one critical end point. In particular, we explicitly show that the appearance of a new critical point associated with a first order line at high temperature and low densities could help to conciliate some lattice results with model predictions. Using different techniques, we perform an extensive thermodynamical analysis to understand the physical nature of the different critical points. For both models, our results suggest that the new first order line which starts at vanishing chemical potential has a more chiral character than the usual line which displays a character more reminiscent of a liquid-gas phase transition.