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

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arxiv 2211.14356 v2 pith:7SOWGLED submitted 2022-11-25 hep-ph nucl-th

classification hep-phnucl-th
keywords hydrodynamicsapplicabilitycollisionsdescriptionhigh-energyrangeaccountedaccurate
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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 is sufficiently small and the early pre-equilibrium 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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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Collective dynamics in heavy and light-ion collisions -- II) Determining the origin of collective behavior in high-energy collisions

    hep-ph 2024-11 conditional novelty 7.0 of 10

    A new observable, W, built from ratios of flow cumulants and transverse energies in same-nucleus collisions at RHIC and LHC, is proposed and validated as a measure of how close a collision system is to hydrodynamic behavior.

  2. Collective dynamics in heavy and light-ion collisions -- I) Kinetic Theory vs. Hydrodynamics

    hep-ph 2024-11 conditional novelty 6.0 of 10

    Event-by-event simulations show elliptic flow in heavy and light ion collisions follows a universal opacity-dependent response curve; hydrodynamics is accurate only above opacity around 3, and oxygen collisions expose...

  3. Few is different: deciphering many-body dynamics in mesoscopic quantum gases

    cond-mat.quant-gas 2025-09 unverdicted novelty 3.0 of 10

    A workshop report mapping the size, equilibrium, and interaction frontiers of hydrodynamic behavior in mesoscopic quantum systems, connecting few-atom Fermi gases and high-energy small collision systems.

  4. Effective theories for nuclei at high energies

    hep-ph 2025-02 unverdicted novelty 1.0 of 10

    This paper reviews the Color Glass Condensate effective theory, covering its foundations, its role in deep inelastic scattering, and its use in setting initial conditions for heavy-ion collisions.

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