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Dresden 2013 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 63: Schwerionenkollisionen und QCD Phasen

HK 63.6: Talk

Thursday, March 7, 2013, 15:30–15:45, HSZ-204

Domain formation and density fluctuations as a signal for the QCD first order phase transition — •Christoph Herold1,2 and Marcus Bleicher1,21Institut für Theoretische Physik, Goethe-Universität, Max-von-Laue-Str. 1, D-60438 Frankfurt — 2Frankfurt Institute for Advanced Studies (FIAS), Ruth-Moufang-Str. 1, D-60438 Frankfurt

We develop a nonequilibrium Polyakov-chiral fluid dynamics model in order to understand dynamical symmetry breaking and to give realistic estimates for experimental observables connected to the QCD phase transition. The expansion of the hot fireball after a heavy ion collision is simulated by a fluid-dynamically propagated quark medium. On this background the order parameters for the chiral and deconfinement transition are explicitly propagated by Langevin equations. Large nonequilibrium fluctuations at the first order transition influence the trajectories in the phase diagram. Here the transition proceeds through the formation of domains where high- and low-temperature phases coexist until finally all chirally symmetric and deconfined domains have decayed. These inhomogeneous structures produce large pressure gradients leading to the formation of high density clusters, an effect that is not observed if the system evolves through the crossover or the critical end point. These clusters might constitute excellent experimental probes for a first order phase transition, e. g. non-monotonic hadron multiplicity fluctuations.
Supported by the Hessian LOEWE initiative through the Helmholtz International Center for FAIR (HIC for FAIR), GSI, and HGS-HIRe.

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