Speaker
Description
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.
