Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 63: Schwerionenkollisionen und QCD Phasen
HK 63.6: Vortrag
Donnerstag, 7. März 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 Bleicher1,2 — 1Institut 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.