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Nuclear Theory·nucl-th

Tuesday·September 17, 2019

17 papers—14 primary·3 cross-listed

All17Primary14Cross-lists3
  1. 15

    [Submitted on 14 Sept 2019] (cross-list from hep-ph)

    Reply to E. Shuryak's Comments on "Three regimes of QCD"

    L. Ya. Glozman🇦🇹

    In his recent Comments E. Shuryak reiterates old, unfortunately misleading arguments in favor of deconfined Quark-Gluon Plasma (QGP) immediately above the chiral restoration pseudocritical temperature. In a Comment devoted to our view of QCD at high temperatures he does not address and even mention the essence of our arguments. In recent years a new "hidden" symmetry in QCD was discovered. It is a symmetry of the electric sector of QCD, that is higher than the chiral symmetry of the QCD Lagrangian as the whole. This symmetry was clearly observed above T_c in spatial correlators and very recently also in time correlators. The latter correlators are directly related to observable spectral density. Then in a model-independent way we conclude that degrees of freedom in QCD above T_c, but below roughly 3T_c, are chirally symmetric quarks bound by the chromoelectric field into color-singlet compounds without the chromomagnetic effects. This regime of QCD has been referred to as a Stringy Fluid since such objects are very reminiscent of strings.At higher temperatures there is a very smooth transition to the partonic degrees of freedom, i.e. to the QGP regime. Here we will address some of the points made by Shuryak.

    Comments:
    4 pp
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1909.06656 [pdf]
    2 citations
  2. 16

    [Submitted on 15 Sept 2019] (cross-list from astro-ph.HE)

    Monte Carlo variations as a tool to assess nuclear physics uncertainties in nucleosynthesis studies

    T. Rauscher

    The propagation of uncertainties in reaction cross sections and rates of neutron-, proton-, and -induced reactions into the final isotopic abundances obtained in nucleosynthesis models is an important issue in studies of nucleosynthesis and Galactic Chemical Evolution. We developed a Monte Carlo method to allow large-scale postprocessing studies of the impact of nuclear uncertainties on nucleosynthesis. Temperature-dependent rate uncertainties combining realistic experimental and theoretical uncertainties are used. The importance of contributions of cross sections of reactions on excited states of the nuclear targets, which have weights different from from the thermal Boltzmann population factors, is explained. From detailed statistical analyses of the Monte Carlo data uncertainties in the final abundances are derived as probability density distributions. Furthermore, based on rate and abundance correlations an automated procedure identifies the most important reactions in complex flow patterns from superposition of many zones or tracers. The method already has been applied to a number of nucleosynthesis processes.

    Comments:
    6 pages, 1 figure; Proceedings of the 27th International Nuclear Physics Conference, Glasgow, UK, 2019; to appear in J. Phys. Conf. Proc; v2: reference added, typos fixed
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1909.06830 [pdf]
    J.Phys.Conf.Ser.(2020)·3 citations
  3. 17

    [Submitted on 16 Sept 2019] (cross-list from hep-lat)

    Spectroscopy From The Lattice: The Scalar Glueball

    Ruairí Brett🇺🇸 · John Bulava🇩🇰 · Daniel Darvish🇺🇸 · Jacob Fallica🇺🇸 · Andrew Hanlon🇩🇪 · Ben Hörz🇺🇸 · Colin Morningstar🇺🇸

    Lattice calculations allow us to probe the low-lying, non-perturbative spectrum of QCD using first principles numerical methods. Here we present the low-lying spectrum in the scalar sector with vacuum quantum numbers including, in fully dynamical QCD for the first time, the mixing between glueball, q-qbar, and meson-meson operators.

    Comments:
    7 pages, 5 figures, Proceedings for The 15th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon, MENU-2019
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1909.07306 [pdf]
    AIP Conf.Proc.(2020)·21 citations

Affiliations

first authorsco-authorsvia INSPIRE