618 research outputs found
Influence of an inhomogeneous and expanding medium on signals of the QCD phase transition
According to a fluid dynamic expansion of the fireball we investigate how the
inhomogeneity of the system influences the chiral phase transition of QCD. We
compare the averaged values of the order parameter in equilibrium with that of
a homogeneous system. If the temperature is averaged over a certain region of
the fireball the corresponding correlation length does not diverge in an
expansion with a critical point.Comment: proceedings for Quark Matter 201
Chiral fluid dynamics with explicit propagation of the Polyakov loop
We present a fully dynamical model to study nonequilibrium effects in both
the chiral and the deconfinement phase transition. The sigma field and the
Polyakov loop as the corresponding order parameters are propagated by Langevin
equations of motion. The locally thermalized background is provided by a fluid
of quarks and antiquarks. Allowing for an exchange of energy and momentum
through dissipative and stochastic processes we ensure that the total energy of
the coupled system remains conserved. We study its relaxational dynamics in
different quench scenarios and are able to observe critical slowing down as
well as the enhancement of long wavelength modes at the critical point. During
the fluid dynamical expansion of a hot plasma fireball typical nonequilibrium
effects like supercooling and domain formation occur when the system evolves
through the first order phase transition.Comment: 20 pages, 22 figure
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