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Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 36: Heavy-Ion Collisions and QCD Phases IX

HK 36.6: Vortrag

Mittwoch, 1. April 2020, 18:00–18:15, J-HS H

Linearized kinetic description of non-equilibrium dynamics in pp and pA collisions — •Clemens Werthmann and Sören Schlichting — Universität Bielefeld, Bielefeld, Deutschland

Momentum anisotropies caused by collective flow phenomena in HICs have been known to convey a rich amount of information on the collision geometry. In pp and pA collisions the collision area is too small - resulting in density gradients that are too large - for the well-understood hydrodynamic description of these anisotropies to be applicable. Instead, a microscopic description of the non-equilibrium dynamics has to be employed. Indeed, numerical simulations based on kinetic theory have reproduced the anisotropies, but they do not allow insight into the mechanisms of their emergence. This prompts attempts to employ analytical treatments of the kinetic theory description, which is highly nontrivial. In order to simplify the problem, the strategy presented in this talk is to apply an appropriate expansion scheme of the Boltzmann equation and then linearize in small anisotropic perturbations of the initial distribution on top of an isotropic Gaussian background.

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