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Nuclear Theory·nucl-th

Wednesday·February 22, 2023

6 papers—2 primary·4 cross-listed

All6Primary2Cross-lists4
  1. 01

    [Submitted on 21 Feb 2023]

    Beam Energy Dependence of the Linear and Mode-Coupled Flow Harmonics Using the A Multi-Phase Transport Model

    Niseem Magdy🇺🇸

    In the framework of the A Multi-Phase Transport (AMPT) model, the multi-particle azimuthal cumulant method is used to calculate the linear and mode-coupled contributions to the quadrangular flow harmonic (), mode-coupled response coefficient as a function of centrality in Au+Au collisions at = 200, 39, 27 and 19.6 GeV. This study indicated that the linear and mode-coupled contributions to the are sensitive to the beam energy change. Nevertheless, the correlations between different order flow symmetry planes and the mode-coupled response coefficients show a weak beam energy dependence. In addition, the presented results suggest that the experimental measurements that span a broad range of beam energies can be an additional constraint for the theoretical models' calculations.

    Comments:
    5 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2302.10373 [pdf]
    Universe(2023)·4 citations
  2. 02

    [Submitted on 21 Feb 2023]

    Attractors for Flow Observables in 2+1D Bjorken Flow

    Victor E. Ambruş🇷🇴 · Sören Schlichting🇩🇪 · Clemens Werthmann🇩🇪

    We examine the capabilities of second-order Israel-Stewart-type hydrodynamics to capture the early-time behaviour of the quark-gluon plasma created in heavy-ion collisions. We point out that at very early times, the dynamics of the fireball is governed by the local 0+1-D Bjorken flow attractor due to the rapid expansion along the longitudinal direction. Discrepancies between hydrodynamics and kinetic theory in this far-from-equilibrium regime leads to disagreement at the level of late-time observables, such as elliptic flow. We show that rescaling the initial energy-density profile for hydrodynamics accounts for such discrepancies, restoring agreement with kinetic theory for large opacities (small shear viscosity / large system size / high energy).

    Comments:
    6 pages, 3 figures. Contribution to the TIM-2022 conference proceedings
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Fluid Dynamics (physics.flu-dyn)
    arXiv:
    2302.10618 [pdf]
    AIP Conf.Proc.(2024)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE