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Nuclear Theory·nucl-th

Monday·September 25, 2023

8 papers—6 primary·2 cross-listed

All8Primary6Cross-lists2
  1. 07

    [Submitted on 21 Sept 2023] (cross-list from hep-ph)

    Revealing the Origin of Mass through Studies of Hadron Spectra and Structure

    Craig D. Roberts🇨🇳

    The Higgs boson is responsible for roughly 1% of the visible mass in the Universe. Obviously, therefore, Nature has another, very effective way of generating mass. In working toward identifying the mechanism, contemporary strong interaction theory has arrived at a body of basic predictions, viz. the emergence of a nonzero gluon mass-scale, a process-independent effective charge, and dressed-quarks with constituent-like masses. These three phenomena - the pillars of emergent hadron mass (EHM) - explain the origin of the vast bulk of visible mass in the Universe. Their expressions in hadron observables are manifold. This contribution highlights a few; namely, some of the roles of EHM in building the meson spectrum, producing the leading-twist pion distribution amplitude, and moulding hadron charge and mass distributions.

    Comments:
    8 pages, 3 figures. Summary of a plenary presentation at MESON 2023, the 17th International Workshop on Meson Physics, Krakow, Poland, 2023 June 22-27
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2309.12486 [pdf]
    EPJ Web Conf.(2024)·0 citations
  2. 08

    [Submitted on 22 Sept 2023] (cross-list from astro-ph.HE)

    Maximum gravitational mass inferred at about precision with multimessenger data of neutron stars

    Yi-Zhong Fan🇨🇳 · Ming-Zhe Han🇨🇳 · Jin-Liang Jiang🇩🇪 · Dong-Sheng Shao🇨🇳 · Shao-Peng Tang🇨🇳

    The maximal gravitational mass of nonrotating neutron stars () is one of the key parameters of compact objects and only loose bounds can be set based on the first principle. With reliable measurements of the masses and/or radii of the neutron stars, can be robustly inferred from either the mass distribution of these objects or the reconstruction of the equation of state (EoS) of the very dense matter. For the first time we take the advantages of both two approaches to have a precise inference of (68.3\% credibility), with the updated neutron star mass measurement sample, the mass-tidal deformability data of GW170817, the mass-radius data of PSR J0030+0451 and PSR J0740+6620, as well as the theoretical information from the chiral effective theory (EFT) and perturbative quantum chromodynamics (pQCD) at low and very high energy densities, respectively. This narrow credible range is benefited from the suppression of the high by the pQCD constraint and the exclusion of the low by the mass function. Three different EoS reconstruction methods are adopted separately, and the resulting and are found to be almost identical, where km is the radius of the most massive non-rotating NS. This precisely evaluated suggests that the EoS of neutron star matter is just moderately stiff and the compact objects detected by the second generation gravitational wave detectors are most likely the lightest black holes.

    Comments:
    17 pages, 9 figures. The latest mass measurements of the neutron stars up to April 2023 have been summarized in Table 1 of the Appendix. Published in PRD with moderate revision
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
    arXiv:
    2309.12644 [pdf]
    PRD(2024)·101 citations

Affiliations

first authorsco-authorsvia INSPIRE