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Nuclear Theory·nucl-th

Wednesday·December 21, 2022

8 papers—3 primary·5 cross-listed

All8Primary3Cross-lists5
  1. 01

    [Submitted on 19 Dec 2022]

    g-mode Oscillations in Neutron Stars with Hyperons

    Vinh Tran🇺🇸 · Suprovo Ghosh🇮🇳 · Nicholas Lozano🇺🇸 · Debarati Chatterjee🇮🇳 · Prashanth Jaikumar🇺🇸

    A common alternative to the standard assumption of nucleonic composition of matter in the interior of a neutron star is to include strange baryons, particularly hyperons. Any change in composition of the neutron star core has an effect on g-mode oscillations of neutron stars, through the compositional dependence of the equilibrium and adiabatic sound speeds. We study the core g-modes of a neutron star contaning hyperons, using a variety of relativistic mean field models of dense matter that satisfy observational constraints on global properties of neutron stars. Our selected models predict a sharp rise in the g-mode frequencies upon the onset of strange baryons. Should g-modes be observed in the near future, their frequency could be used to test the presence of hyperonic matter in the core of neutron stars.

    Comments:
    17 pages, 7 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
    arXiv:
    2212.09875 [pdf]
    PRC(2023)·35 citations
  2. 02

    [Submitted on 20 Dec 2022]

    Conformality and percolation threshold in neutron stars

    Michał Marczenko🇵🇱 · Larry McLerran🇺🇸 · Krzysztof Redlich🇵🇱 · Chihiro Sasaki🇵🇱

    Speed of sound is given attention in multi-messenger astronomy as it encodes information of the dense matter equation of state. Recently the trace anomaly was proposed as a more informative quantity. In this work, we statistically determine the speed of sound and trace anomaly and show that they are driven to their conformal values at the centers of maximally massive neutron stars. We show that the local peak in the speed of sound can be associated with deconfinement along with percolation conditions in QCD matter.

    Comments:
    Contribution to the Proceedings of 15th Quark Confinement and the Hadron Spectrum (based on arXiv:2207.13059)
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
    arXiv:
    2212.10165 [pdf]
    EPJ Web Conf.(2022)·5 citations
  3. 03

    [Submitted on 20 Dec 2022]

    New insights into the pole parameters of the , the and the

    Daniel Sadasivan🇨🇱 · Maxim Mai🇩🇪 · Michael Döring🇺🇸 · Ulf-G. Meißner🇩🇪 · Felipe Amorim🇨🇱 · John Paul Klucik🇨🇱 · Jun-Xu Lu🇨🇳 · Li-Sheng Geng🇨🇳

    A coupled-channel S- and P-wave next-to-leading order chiral-unitary approach for strangeness meson-baryon scattering is extended to include the new data from the KLOE and AMADEUS experiments as well as the mass distribution of the . The positions of the poles on the second Riemann sheet corresponding to the pole and the and poles as well as the couplings of these states to various channels are calculated. We find that the resonance positions and branching ratios are on average determined with about 20\% higher precision when including the KLOE and AMADEUS data. Additionally, for the first time, the correlations between the parameters of the poles are investigated and shown to be relevant. We also find that the has negligible influence on the properties of the states given the available data. Still, we identify isospin-1 cusp structures in the present solution in light of new measurements of line-shapes by the Belle collaboration.

    Comments:
    21 pages, 6 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2212.10415 [pdf]
    Front.Phys.(2023)·17 citations

Affiliations

first authorsco-authorsvia INSPIRE