Establishing the Range of Applicability of Hydrodynamics in High-Energy Collisions

Victor E. Ambruş (Department of Physics, West University of Timişoara, Bulevardul Vasile Pârvan 4, Timişoara 300223, Romania) ; S. Schlichting (Fakultät für Physik, Universität Bielefeld, D-33615 Bielefeld, Germany) ; C. Werthmann (Fakultät für Physik, Universität Bielefeld, D-33615 Bielefeld, Germany; Incubator of Scientific Excellence-Centre for Simulations of Superdense Fluids, University of Wrocław, pl. Maxa Borna 9, 50-204 Wrocław, Poland)

We simulate the space-time dynamics of high-energy collisions based on a microscopic kinetic description in the conformal relaxation time approximation, 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 Re1 is sufficiently small and the early preequilibrium stage is properly accounted for. We further discuss the implications of our findings for the (in)applicability of hydrodynamics in proton-proton, proton-nucleus, and light nucleus collisions.

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      "value": "We simulate the space-time dynamics of high-energy collisions based on a microscopic kinetic description in the conformal relaxation time approximation, 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 <math><mrow><msup><mrow><mi>Re</mi></mrow><mrow><mo>\u2212</mo><mn>1</mn></mrow></msup></mrow></math> is sufficiently small and the early preequilibrium stage is properly accounted for. We further discuss the implications of our findings for the (in)applicability of hydrodynamics in proton-proton, proton-nucleus, and light nucleus collisions."
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Published on:
14 April 2023
Publisher:
APS
Published in:
Physical Review Letters , Volume 130 (2023)
Issue 15
DOI:
https://doi.org/10.1103/PhysRevLett.130.152301
arXiv:
2211.14356
Copyrights:
Published by the American Physical Society
Licence:
CC-BY-4.0

Fulltext files: