Speaker
Description
The early dynamics in heavy-ion collisions involves a rapid, far from equilibrium evolution. This early pre-equilibrium stage of the dynamics can be modeled using kinetic equations. The effect of this pre-equilibrium stage on final observables derived from transverse momenta of emitted particles is negligible. Therefore, the kinetic equations in the relaxation time approximation for a non-boost invariant system are solved (P.Bozek Phys.Rev.C 107 (2023) 034916). The asymmetry of the flow with respect to the reaction plane at different rapidities is found to be very sensitive to the degree of non-equilibrium in the evolution. This suggests that the rapidity odd directed flow is a sensitve probe of the occurrence of non-equilibrium effects and could be used to estimate the asymmetry of the pressure between the longitudinal and transverse directions. The study of kinetic evolution in the longitudinal direction allows also a modelling of the early pre-Bjorken flow stage of the equilibration.
| Category | Theory |
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