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HK: Fachverband Physik der Hadronen und Kerne
HK 44: Heavy-Ion Collisions and QCD Phases XI
HK 44.6: Vortrag
Donnerstag, 2. April 2020, 15:30–15:45, J-HS G
Development of attractor solutions within the kinetic Boltzmann parton cascade — •Benjamin Schüller1, Gabriel Denicol2, Kai Gallmeister1 und Carsten Greiner1 — 1Institut für Theoretische Physik, Goethe Universität, Frankfurt/Main — 2Instituto de Física, Universidade Federal Fluminense
We investigate the longitudinal boost invariant Bjorken expansion of a gluon gas in the transversal plane for different initial particle distributions using either a set of constant cross sections or a set of constant values for the shear viscosity to entropy ratio with the partonic transport casacade BAMPS ("Boltzmann Approach to Multi-Parton Scatterings").
As a first scenario the particle distribution is constant in the transverse plane (0+1D expansion), whereas the second scenario comprises a symmetric transversal Gaussian profile (1+1D expansion). Furthermore, we investigate the influence of different degrees of anisotropy of the momentum space on the evolution of the system. We compute the time evolution of several quantities like π/P and PL/PT. In doing so, we observe that irrespective of the degree of anisotropy in momentum space the different observables merge into one another as an attractor in the course of time. Finally, we compare our results to the results of relativistic viscous fluid dynamics and obtain very good agreement for the 0+1D expansion and only fair agreement for the 1+1D expansion.
Supported by BMBF and GSI F&E.