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Opacity dependence of transverse flow, pre-equilibrium and applicability of hydrodynamics in heavy-ion collisions

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arxiv 2211.14379 v2 pith:COYJ3P7V submitted 2022-11-25 hep-ph nucl-th

classification hep-phnucl-th
keywords collisionsdependenceflowheavy-ionhydrodynamickineticopacityapplicability
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We evaluate the full opacity dependence of collective flow in high-energy heavy-ion collisions within a microscopic kinetic description based on the Boltzmann equation in the conformal relaxation time approximation. By comparing kinetic theory calculations to hydrodynamic and hybrid simulations for an average initial state, we point out shortcomings and inaccuracies of hydrodynamic models and present modified simulation setups to improve them.

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Cited by 5 Pith papers

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

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    In the long-wavelength limit, jet-wake angular moments with ℓ≥3 vanish in hydrodynamics and directly image the non-hydrodynamic relaxation spectrum of the medium.

  2. 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.

  3. Experimentally accessible drive-induced attractor in a Fermi gas near unitarity

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  4. 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...

  5. 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.

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