Speaker
Dr
Piotr Bozek
Description
The estimation of deviations from local equilibrium in heavy-ion
collisions is essential in getting information on the microscopic
rates/processes in the dense matter. We show that elliptic flow observables
are strongly dominated by dissipative processes at the hadronic stage. On the
other hand, directed flow is an observable sensitive to the expansion details
at the first 1-2fm/c. It is the only observable requiring a simultaneous
acceleration from the longitudinal and transverse pressures. We present first
calculation from 3+1D hydrodynamics assuming non-isotropic pressure and show
that directed flow data indicate a fast pressure equilibration (<0.25fm/c).
Primary author
Dr
Piotr Bozek
