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Nuclear Theory·nucl-th

Friday·March 22, 2024

7 papers—2 primary·5 cross-listed

All7Primary2Cross-lists5
  1. 01

    [Submitted on 21 Mar 2024]

    Conditional variational autoencoder inference of neutron star equation of state from astrophysical observations

    Márcio Ferreira · Michał Bejger

    We present a new inference framework for neutron star astrophysics based on conditional variational autoencoders. Once trained, the generator block of the model reconstructs the neutron star equation of state from a given set of mass-radius observations. While the pressure of dense matter is the focus of the present study, the proposed model is flexible enough to accommodate the reconstructing of any other quantity related to dense matter equation of state. Our results show robust reconstructing performance of the model, allowing to make instantaneous inference from any given observation set.

    Comments:
    9 pages, 7 figures, published version
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2403.14266 [pdf]
    PRD(2025)·9 citations
  2. 02

    [Submitted on 21 Mar 2024]

    Tensor-force effects on nuclear matter in relativistic ab initio theory

    Sibo Wang · Hui Tong · Chencan Wang · Qiang Zhao · Peter Ring · Jie Meng

    Within the relativistic Brueckner-Hartree-Fock theory in the full Dirac space, the tensor-force effects on infinite nuclear matter are elucidated by subtracting the matrix elements of tensor forces from the realistic nucleon-nucleon interaction. The tensor-force effects for the binding energy per particle of symmetric nuclear matter (SNM) as well as the symmetry energy are attractive and are more pronounced around the empirical saturation density, while the tensor forces have little impact on the pure neutron matter. By tuning the tensor-force strength, an infinite (negative) scattering length in the spin-triplet channel is found. This locates the dilute SNM with only the - channel interaction at the unitary limit. Its ground-state energy is found proportional to the energy of a free Fermi gas with a scaling factor 0.38, revealing good universal properties. This work paves the way to study the tensor-force effects in neutron stars as well as finite nuclei from realistic nucleon-nucleon interactions, highlights the role of the tensor force on the deviation of the nuclear physics to the unitary limit, and provides valuable reference for studies of the four-component unitary Fermi gas.

    Comments:
    5 pages, 2 figures, discussion on four-component unitary Fermi gas is updated, accepted by Science Bulletin
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2403.14474 [pdf]
    Sci.Bull.(2024)·10 citations

Affiliations

first authorsco-authorsvia INSPIRE