SMuK 2021 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Heavy-Ion Collisions and QCD Phases V

HK 27.4: Talk

Friday, September 3, 2021, 15:00–15:15, H1

Exploring the Pre-Equilibrium Dynamics of Longitudinal Fluctuations in Heavy-Ion Collisions — •Stephan Ochsenfeld — Bielefeld University, Bielefeld, Germany

Non-equilibrium Green*s functions provide an efficient way to describe the pre-equilibrium evolution of macroscopic quantities in early stages of heavy-ion collisions. Within the kinetic theory framework we derive a new method to calculate time dependent non-equilibrium Green*s functions describing the evolution of energy and momentum perturbations on top of an evolving far-from-equilibrium boost invariant background. As extension to transverse perturbations we also consider fluctuations parallel to the beam direction. By calculating the Green*s functions in relaxation time approximation, we show that in both types of perturbations only modes with long wavelength survive up into the hydrodynamic regime, albeit inhibiting sightly different behavior.