Gießen 2024 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 36: Focus Session II: Emergence of Collectivity in Few-Body Hadron Systems

HK 36.3: Hauptvortrag

Mittwoch, 13. März 2024, 15:00–15:30, HBR 14: HS 1

Hydrodynamic attractors and transport in small systems — •Aleksas Mazeliauskas — Institut für Theoretische Physik, Universität Heidelberg, Heidelberg, Germany

The emergence of a hydrodynamic attractor--a universal far-from-equilibrium fluid behaviour--is one of the dominant explanations for the success of hydrodynamic models in heavy-ion collisions [1]. QCD kinetic simulations have shown rapid thermalisation of Quark-Gluon Plasma and the applicability of hydrodynamic descriptions at times of 1fm/c in heavy-ion collisions. However, very similar computations indicate that in smaller proton-proton collisions hydrodynamics is inapplicable [2]. This poses the fundamental question on the origins of observed collectivity in few-body systems. Ultracold quantum gas experiments provide unique access to precisely investigate the applicability of different hydrodynamic frameworks in mesoscopic systems [3,4]. In this talk, I will discuss the status and prospects of testing different interpretations of collectivity using utracold gas experiments and what these systems can tell us about few-body hadronic collisions.

Refs.:

1. J. Berges, M.P. Heller, A. Mazeliauskas and R. Venugopalan, Rev. Mod. Phys. 93 (2021) 035003

2. V.E. Ambrus, S. Schlichting, C. Werthmann, Phys.Rev.Lett. 130 (2023) 15, 152301

3. S. Floerchinger, G. Giacalone, L.H. Heyen, L. Tharwat, Phys.Rev.C 105 (2022) 4, 044908

4. S. Brandstetter, P. Lunt et al., arXiv:2308.09699v1 (2023)