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Nuclear Theory·nucl-th

Wednesday·March 27, 2024

11 papers—7 primary·4 cross-listed

All11Primary7Cross-lists4
  1. 08

    [Submitted on 26 Mar 2024] (cross-list from gr-qc)

    Rapid neutron star equation of state inference with Normalising Flows

    Jordan McGinn · Arunava Mukherjee · Jessica Irwin · Christopher Messenger · Michael J. Williams · Ik Siong Heng

    The first direct detection of gravitational waves from binary neutron stars on the 17th of August, 2017, (GW170817) heralded the arrival of a new messenger for probing neutron star astrophysics and provided the first constraints on neutron star equation of state from gravitational wave observations. Significant computational effort was expended to obtain these first results and therefore, as observations of binary neutron star coalescence become more routine in the coming observing runs, there is a need to improve the analysis speed and flexibility. Here, we present a rapid approach for inferring the neutron star equation of state based on Normalising Flows. As a demonstration, using the same input data, our approach, ASTREOS, produces results consistent with those presented by the LIGO-Virgo collaboration but requires < 1 sec to generate neutron star equation of state confidence intervals. Furthermore, ASTREOS allows for non-parametric equation of state inference. This rapid analysis will not only facilitate neutron star equation of state studies but can potentially enhance future alerts for electromagnetic follow-up observations of binary neutron star mergers.

    Comments:
    4 + 2 pages, 2 figures
    Subjects:
    General Relativity and Quantum Cosmology (gr-qc); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2403.17462 [pdf]
    15 citations
  2. 09

    [Submitted on 26 Mar 2024] (cross-list from hep-ph)

    Hidden-charm pentaquark states in the chiral SU(3) quark model

    Du Wang🇨🇳 · Wen-Ling Wang🇨🇳 · Fei Huang🇨🇳

    In this work, we systematically calculate the spectrum of hidden-charm pentaquark states in the chiral SU(3) quark model, which has been quite successful in reproducing consistently the energies of octet and decuplet baryon ground states, the binding energy of deuteron, and the nucleon-nucleon () scattering phase shifts and mixing parameters for partial waves with total angular momentum up to . The Hamiltonian contains the one-gluon-exchange (OGE) potential, the Goldstone-boson-exchange (GBE) potential, the confinement potential, and the kinetic energy of the system. We solve the Schrödinger equation by use of the variational method. It is found that the masses of all the experimentally observed , , , and states are much overestimated, indicating that these states are not compact pentaquark states in the chiral SU(3) quark model. All other states are found to lie much above the corresponding baryon-meson thresholds, and thus are not suggested as stable pentaquark states due to their fall-apart decays. A detailed comparison of the results with those obtained in the OGE model and the chromomagnetic interaction (CMI) model is further given.

    Comments:
    9 pages, 1 figure. arXiv admin note: substantial text overlap with arXiv:2403.15187
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2403.17756 [pdf]
    PRC(2024)·3 citations
  3. 10

    [Submitted on 26 Mar 2024] (cross-list from hep-th)

    Spectra of correlators in the relaxation time approximation of kinetic theory

    Matej Bajec🇸🇮 · Sašo Grozdanov🇸🇮 · Alexander Soloviev🇸🇮

    The relaxation time approximation (RTA) of the kinetic Boltzmann equation is likely the simplest window into the microscopic properties of collective real-time transport. Within this framework, we analytically compute all retarded two-point Green's functions of the energy-momentum tensor and a conserved current in thermal states with classical massless particles (a `CFT') at non-zero density, and in the absence and presence of broken translational symmetry. This is done in and dimensions. RTA allows a full explicit analysis of the analytic structure of different correlators (poles versus branch cuts) and the transport properties that they imply (the thermoelectric conductivities, and the hydrodynamic, quasihydrodynamic and gapped mode dispersion relations). Our inherently weakly coupled analysis thereby also enables a direct comparison with previously known strongly coupled results in holographic CFTs dual to the Einstein-Maxwell-axion theories.

    Comments:
    39 pages, 5 figures. Version accepted in JHEP
    Subjects:
    High Energy Physics — Theory (hep-th); Quantum Gases (cond-mat.quant-gas); Nuclear Theory (nucl-th)
    arXiv:
    2403.17769 [pdf]
    JHEP(2024)·30 citations
  4. 11

    [Submitted on 26 Mar 2024] (cross-list from hep-ph)

    Probing the shape of the quark-gluon plasma droplet via event-by-event QGP tomography

    Bithika Karmakar🇷🇸 · Dusan Zigic🇷🇸 · Pasi Huovinen🇷🇸 · Marko Djordjevic🇵🇱 · Magdalena Djordjevic🇷🇸 · Jussi Auvinen🇫🇮

    This study investigates Quark-Gluon Plasma (QGP) in heavy-ion collisions through two avenues: high- frameworks and hydrodynamic modeling. Using the TENTo model, we find that IP-Glasma mimicking value aligns well with high- data, in agreement with Bayesian analysis of the low- regime. While adjusting values may improve a fit to a particular high- observable, it does not permit an earlier onset of transverse expansion.

    Comments:
    15 pages, 6 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2403.17817 [pdf]
    PRC(2024)·10 citations

Affiliations

first authorsco-authorsvia INSPIRE