| Issue |
EPJ Web Conf.
Volume 296, 2024
30th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions (Quark Matter 2023)
|
|
|---|---|---|
| Article Number | 05003 | |
| Number of page(s) | 4 | |
| Section | Collective Dynamics | |
| DOI | https://doi.org/10.1051/epjconf/202429605003 | |
| Published online | 26 June 2024 | |
https://doi.org/10.1051/epjconf/202429605003
Establishing the Range of Applicability of Hydrodynamics in High-Energy Collisions
1 Fakultät für Physik, Universität Bielefeld, D-33615 Bielefeld, Germany
2 Department of Physics, West University of Timişoara, Bd. Vasile Pârvan 4, Timişoara 300223, Romania
3 Incubator of Scientific Excellence-Centre for Simulations of Superdense Fluids, University of Wrocław, pl. Maxa Borna 9, 50-204 Wrocław, Poland
* e-mail: cwerthmann@physik.uni-bielefeld.de
Published online: 26 June 2024
We simulate the space-time dynamics of high-energy collisions based on a microscopic kinetic description, in order to determine the range of applicability of an effective description in relativistic viscous hydrodynamics. We find that hydrodynamics provides a quantitatively accurate description of collective flow when the average inverse Reynolds number Re−1 is sufficiently small and the early pre-equilibrium stage is properly accounted for. By determining the breakdown of hydrodynamics as a function of system size and energy, we find that it is quantitatively accurate in central lead-lead collisions at LHC energies, but should not be used in typical proton-lead or proton-proton collisions, where the development of collective flow cannot accurately be described within hydrodynamics.
© The Authors, published by EDP Sciences, 2024
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