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Nuclear Theory·nucl-th

Thursday·March 8, 2018

5 papers—3 primary·2 cross-listed

All5Primary3Cross-lists2
  1. 01

    [Submitted on 6 Mar 2018]

    The Deconfinement Phase Transition in Proto-Neutron-Star Matter

    J. Roark🇺🇸 · V. Dexheimer🇺🇸

    In this work, we study in detail the deconfinement phase transition that takes place in hot/dense nuclear matter in the context of neutron stars and proto-neutron stars (in which lepton fraction is fixed). The possibility of different mixtures of phases with different locally and globally conserved quantities is considered in each case. For this purpose, the Chiral Mean Field (CMF) model, an effective relativistic model that includes self-consistent chiral symmetry restoration and deconfinement to quark matter, is employed. Finally, we compare our results with data provided by PQCD for different temperatures and conditions.

    Comments:
    version accepted to PRC
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR)
    arXiv:
    1803.02411 [pdf]
    PRC(2018)·48 citations
  2. 02

    [Submitted on 6 Mar 2018]

    Open charm and dileptons from relativistic heavy-ion collisions

    Taesoo Song🇩🇪 · Wolfgang Cassing🇩🇪 · Pierre Moreau🇩🇪 · Elena Bratkovskaya🇩🇪

    Dileptons are considered as one of the cleanest signals of the quark-gluon plasma (QGP), however, the QGP radiation is masked by many 'background' sources from either hadronic decays or semileptonic decays from correlated charm pairs. In this study we investigate the relative contribution of these channels in heavy-ion collisions from 8 GeV to 5 TeV with a focus on the competition between the thermal QGP radiation and the semileptonic decays from correlated meson pairs. As a 'tool' we employ the parton-hadron-string dynamics (PHSD) transport approach to study dilepton spectra in Pb+Pb (Au+Au) collisions in a wide energy range incorporating for the first time a fully microscopic treatment of the charm dynamics and their semileptonic decays. We find that the dileptons from correlated meson decays dominate the 'thermal' radiation from the QGP in central Pb+Pb collisions at the intermediate masses (1.2 GeV 3 GeV) for 40 GeV, while for 8 to 20 GeV the contribution from decays to the intermediate mass dilepton spectra is subleading such that one should observe a rather clear signal from the QGP radiation. We, furthermore, study the -spectra and the of single electrons at different energies as well as the excitation function of the inverse slope of the - spectra for intermediate-mass dileptons from the QGP and from charm decays. We find moderate but characteristic changes in the inverse slope parameter for 20 GeV which can be observed experimentally in high statistics data. Additionally, we provide detailed predictions for dilepton spectra from Pb+Pb collisions at 5.02 TeV.

    Comments:
    21 pages, 17 figures, accepted for PRC publication. arXiv admin note: text overlap with arXiv:1605.07887
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1803.02698 [pdf]
    PRC(2018)·61 citations
  3. 03

    [Submitted on 7 Mar 2018]

    Neutron star tidal deformabilities constrained by nuclear theory and experiment

    Yeunhwan Lim · Jeremy W. Holt

    We confront observational data from gravitational wave event GW170817 with microscopic modeling of the cold neutron star equation of state. We develop and employ a Bayesian statistical framework that enables us to implement constraints on the equation of state from laboratory measurements of nuclei and state-of-the-art chiral effective field theory methods. The energy density functionals constructed from the posterior probability distributions are then used to compute consistently the neutron star equation of state from the outer crust to the inner core, assuming a composition consisting of protons, neutrons, electrons, and muons. In contrast to previous studies, we find that the 95% credibility range of predicted neutron star tidal deformabilities () for a 1.4 solar-mass neutron star is already consistent with the upper bound deduced from observations of the GW170817 event. However, we find that lower bounds on the neutron star tidal deformability will very strongly constrain microscopic models of the dense matter equation of state. We also demonstrate a strong correlation between the neutron star tidal deformability and the pressure of beta-equilibrated matter at twice saturation density.

    Comments:
    6 pages, 6 figures, to appear in Physical Review Letters
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
    arXiv:
    1803.02803 [pdf]
    PRL(2018)·210 citations

Affiliations

first authorsco-authorsvia INSPIRE