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Nuclear Theory·nucl-th

Wednesday·August 3, 2022

3 papers—2 primary·1 cross-listed

All3Primary2Cross-lists1
  1. 01

    [Submitted on 1 Aug 2022]

    Does quark-gluon plasma feature an extended hydrodynamic regime?

    Weiyao Ke🇺🇸 · Yi Yin🇨🇳

    We investigate the response of the near-equilibrium quark-gluon plasma (QGP) to perturbation at non-hydrodynamic gradients. We propose a conceivable scenario under which sound mode continues to dominate the medium response in this regime. Such a scenario has been observed experimentally for various liquids and liquid metals. We further show this extended hydrodynamic regime (EHR) indeed exists for both the weakly-coupled kinetic equation in the relaxation time approximation (RTA) and the strongly-coupled supersymmetric Yang-Mills (SYM) theory. We construct a simple but nontrivial extension of Müeller-Isareal-Stewart (MIS) theory, namely MIS*, and demonstrate that it describes EHR response for both RTA and SYM theory. This indicates that MIS* equations can potentially be employed to search for QGP EHR via heavy-ion collisions.

    Comments:
    9 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2208.01046 [pdf]
    PRL(2023)·20 citations
  2. 02

    [Submitted on 2 Aug 2022]

    Directed flow of in high-energy heavy-ion collisions and potential in dense nuclear matter

    Yasushi Nara🇯🇵 · Asanosuke Jinno🇯🇵 · Koichi Murase🇯🇵 · Akira Ohnishi🇯🇵

    We investigate the sensitivity of the directed flow to the potential in mid-central Au + Au collisions at -- GeV. The potential obtained from the chiral effective field theory (EFT) is used in a microscopic transport model, a vector version of relativistic quantum molecular dynamics (RQMDv). We find that the density-dependent potentials, obtained from the EFT assuming weak momentum dependence of the potential, reproduce the rapidity and the beam-energy dependence of the directed flow measured by the STAR collaboration in the Beam Energy Scan program. Although the directed flow is insensitive to the density dependence of the potential, it is susceptible to the momentum dependence. We also show that a hydrodynamics picture based on the blast-wave model predicts a similarity of the proton, , and directed flows, but the directed flow of baryons slightly deviates from other baryons. We also show that the quark coalescence predicts different rapidity dependence of the directed flows for hyperons. These investigations suggest that measurements of a wide range of the rapidity dependence of the directed flow of hyperons may provide important information about the properties of hot and dense matter created in high-energy heavy-ion collisions.

    Comments:
    11 pages, 9 figures. version accepted for publication
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2208.01297 [pdf]
    PRC(2022)·44 citations

Affiliations

first authorsco-authorsvia INSPIRE