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Nuclear Theory·nucl-th

Thursday·November 4, 2021

9 papers—5 primary·4 cross-listed

All9Primary5Cross-lists4
  1. 06

    [Submitted on 24 Oct 2021] (cross-list from hep-ph)

    Neutron-Mirror Neutron oscillations in Matter

    Yuri Kamyshkov🇺🇸 · James Ternullo🇺🇸 · Louis Varriano🇺🇸 · Zurab Berezhiani🇮🇹

    The possibility that a neutron can be transformed to a hidden sector particle remains intriguingly open. Proposed theoretical models conjecture that the hidden sector can be represented by a mirror sector, and the neutron n can oscillate into its sterile mirror twin n', exactly or nearly degenerate in mass with n. Oscillations n - n' can take place in vacuum and in the environment of the regular matter and the magnetic field where only neutron will be subject of interaction with the environment. We describe the propagation of the oscillating n - n' system as a particle of the cold neutron beam passing through the dense absorbing materials in connection with the possible regeneration type of experiments where the effect of n -> n' -> n transformation can be observed.

    Comments:
    12 pages, 3 figures, submitted to MDPI "Symmetry" journal
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2111.01791 [pdf]
    Symmetry(2022)·19 citations
  2. 07

    [Submitted on 2 Nov 2021] (cross-list from hep-lat)

    The transversity parton distribution function of the nucleon using the pseudo-distribution approach

    Colin Egerer🇺🇸 · Christos Kallidonis🇺🇸 · Joseph Karpie🇺🇸 · Nikhil Karthik🇺🇸 · Christopher J. Monahan🇺🇸 · Wayne Morris🇺🇸 · Kostas Orginos🇺🇸 · Anatoly Radyushkin🇺🇸 · Eloy Romero🇺🇸 · Raza Sabbir Sufian🇺🇸 · Savvas Zafeiropoulos🇫🇷

    We present a determination of the non-singlet transversity parton distribution function (PDF) of the nucleon, normalized with respect to the tensor charge at GeV from lattice quantum chromodynamics. We apply the pseudo-distribution approach, using a gauge ensemble with a lattice spacing of 0.094 fm and the light quark mass tuned to a pion mass of 358 MeV. We extract the transversity PDF from the analysis of the short-distance behavior of the Ioffe-time pseudo-distribution using the leading-twist next-to-leading order (NLO) matching coefficients calculated for transversity. We reconstruct the -dependence of the transversity PDF through an expansion in a basis of Jacobi polynomials in order to reduce the PDF ansatz dependence. Within the limitations imposed by a heavier-than-physical pion mass and a fixed lattice spacing, we present a comparison of our estimate for the valence transversity PDF with the recent global fit results based on single transverse spin asymmetry. We find the intrinsic nucleon sea to be isospin symmetric with respect to transversity.

    Comments:
    25 pages, 13 figures
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2111.01808 [pdf]
    PRD(2022)·54 citations
  3. 08

    [Submitted on 2 Nov 2021] (cross-list from astro-ph.HE)

    A New Constraint on the Nuclear Equation of State from Statistical Distributions of Compact Remnants of Supernovae

    Mikhail M. Meskhi · Noah E. Wolfe · Zhenyu Dai · Carla Frohlich · Jonah M. Miller · Raymond K. W. Wong · Ricardo Vilalta

    Understanding how matter behaves at the highest densities and temperatures is a major open problem in both nuclear physics and relativistic astrophysics. This physics is often encapsulated in the so-called high-temperature nuclear equation of state, which influences compact binary mergers, core-collapse supernovae, and many more phenomena. One such case is the type (either black hole or neutron star) and mass of the remnant of the core collapse of a massive star. For each of six candidate equations of state, we use a very large suite of spherically symmetric supernova models to generate a suite of synthetic populations of such remnants. We then compare these synthetic populations to the observed remnant population. We thus provide a novel constraint on the high-temperature nuclear equation of state and describe which EOS candidates are more or less favored by this metric.

    Comments:
    Accepted by ApJ Letters; revised version; 3 figures, 2 tables
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    2111.01815 [pdf]
    ApJL(2022)·11 citations
  4. 09

    [Submitted on 3 Nov 2021] (cross-list from hep-ph)

    On the nature of the mass-gap object in the GW190814 event

    Luiz L. Lopes🇧🇷 · Debora P. Menezes🇧🇷

    In this work, we make a very extensive study on the conditions that allow the mass-gap object in the GW190814 event to be faced as a degenerate star instead of a black hole. We begin revisiting some parametrizations of the Quantum Hadrodynamics (QHD) and then study under which conditions the hyperons are present in such a massive star. Afterward, using a vector MIT based model, we study if self-bound quark stars, satisfying the Bodmer-Witten conjecture fulfill all the observational constraints. Finally, we study hybrid stars within a Maxwell construction and check for what values of the bag, as well as the vector interaction, a quark core star with only nucleons, and with nucleons admixed with hyperons can reach at least 2.50 M. We conclude that, depending on the choice of parameters, none of the possibilities can be completely ruled out, i.e., the mass-gap object can be a hadronic (either nucleonic or hyperonic), a quark, or a hybrid star. However, some cases are more probable than others.

    Comments:
    15 pages, 11 figures, 6 tables
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    2111.02247 [pdf]
    ApJ(2022)·45 citations

Affiliations

first authorsco-authorsvia INSPIRE