Speaker
Prof.
Elena Bratkovskaya
(GSI and Uni. Frankfurt, Germany)
Description
We address the issue of the deconfined phase transition from hadronic to partonic matter on microscopic basis.
We report about results from an extended dynamical
quasiparticle model (DQPM$^*$) in which the effective parton
propagators have a complex selfenergy that depends on the
temperature $T$ of the medium as well as on the chemical potential
$\mu_q$ and the parton three-momentum ${\vec p}$ with respect
to the medium at rest. It is demonstrated that this approach allows
for a good description of QCD thermodynamics with respect to the
entropy density, pressure etc. above the critical temperature $T_c
\approx$ 158 MeV. Furthermore, the quark susceptibility $\chi_q$ and
the quark number density $n_q$ are found to be reproduced
simultaneously at zero and finite quark chemical potential. The
shear and bulk viscosities $\eta, \zeta$, and the electric
conductivity $\sigma_e$ from the DQPM$^*$ also turn out in close
agreement with lattice results for $\mu_q$ =0. The DQPM$^*$,
furthermore, allows to evaluate the momentum $p$, $T$ and $\mu_q$
dependencies of the partonic degrees of freedom also for larger
$\mu_q$ which are mandatory for transport studies of heavy-ion
collisions in the regime 5 GeV $< \sqrt{s_{NN}} <$ 10 GeV.
Furthermore, based on the microscopic off-shell PHSD model for strongly interacting matter we analyse the possible traces of the deconfinement and chiral phase transitions in different observables
of heavy-ion collisions - particle spectra and ratios, collective
properties and fluctuations. In particular, we discuss the
perspectives to identify a possible critical point in
the ($T,\mu_B)$ phase diagram exploring the strangeness
degrees of freedom.
Author
Prof.
Elena Bratkovskaya
(GSI and Uni. Frankfurt, Germany)
