Time & Place: Nov. 14, Thursday, 2:00pm, Room 9409
   
Speaker: Prof. Larisa Bravina, University of Oslo, Norway
   
Title: spatial sub-separation of strangeness from anti-strangeness in heavy-ion collisions at energies of FAIR and NICA
     
Abstract:  
   The heavy-ion collisions at energies of FAIR and NICA are studied within
   the microscopic transport model. The whole interaction area is
   subdivided into the small cells. We perform the analysis of the
   space-time evolution of all particles in all cells, in the $T-\mu_B$ and
   $T-\mu_S$ planes, and the analysis of the finally emitted strange and
   non-strange particles in the $x-t$ plane. Following the time evolution of
   all distributions, we clearly see the spacial separation of strangeness
   from anti-strangeness, as well as earlier freeze-out times of kaons and
   pions compared to those of protons and Lambdas. The latter appear to be
   frozen out at lower temperature and larger strangeness chemical potential.
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Time & Place: Nov. 14, Thursday, 2:45 pm, Room 9409
   
Speaker: Prof. Evgeny ZABRODIN, University of Oslo, Norway
   
Title: Early thermalization and shear viscosity to entropy ratio in heavy-ion collisions at energies of BES, FAIR and NICA
     
Abstract:

Equilibration of highly excited baryon-rich matter is studied within the
microscopic model calculations in A+A collisions at energies of BES, FAIR
and NICA. It is shown that the system evolution from the very beginning
of the collision can be approximated by relativistic hydrodynamics, although
 the hot and dense nuclear matter is not in local equilibrium yet.
During the evolution of the fireball the extracted values of energy density,
net baryon and net strangeness densities are used as input to Statistical
Model (SM) in order to calculate temperature, chemical potentials and entropy density of the system.
Also, they are used as an input for the box with periodic boundary conditions to
investigate influence of initial cut-off time on momentum correlators in the infinite nuclear matter. Shear viscosity
is calculated according to the Green-Kubo formalism.
At all energies, shear viscosity to entropy density ratio shows minimum
at time corresponding to maximum baryon density. The ratio dependence on
the SM temperature, baryon chemical potential and strangeness chemical
potential is investigated.