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HK: Fachverband Physik der Hadronen und Kerne

HK 22: Heavy-Ion Collisions and QCD Phases IV

HK 22.4: Talk

Tuesday, March 12, 2024, 16:45–17:00, HBR 62: EG 05

Non-Hydrodynamic Modes from Linear Response in Kinetic Theory — •Stephan Ochsenfeld and Sören Schlichting — Universität Bielefeld, 33615 Bielefeld, Deutschland

Viscous hydrodynamics serves as a successful mesoscopic description of the QGP produced in relativistic heavy-ion collisions. In order to investigate, how such an effective description emerges from the underlying microscopic dynamics we calculate the non-hydrodynamic and hydrodynamic modes of linear response in the sound channel from a first-principle calculation in kinetic theory. We do this with a new approach wherein we linearize and discretize the collision kernel to calculate eigenvalues directly. This allows us to study the Green's functions at any point in time or frequency space. Our study focuses on scalar theory with quartic interaction and we find that the analytic structure of Green's functions in the complex plane is far more complicated than just poles or cuts which is the first step towards an equivalent study in QCD kinetic theory.

Keywords: Non-Hydrodynamic Modes; Kinetic Theory; Scalar Theory; Hydrodynamics