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Nuclear Theory·nucl-th

Wednesday·October 22, 2025

7 papers—5 primary·2 cross-listed

All7Primary5Cross-lists2
  1. 06

    [Submitted on 16 Oct 2025] (cross-list from hep-ph)

    Interactions of the deuteron with a hadronic medium

    L. M. Abreu🇧🇷 · R. Higa🇧🇷 · R. O. Magalhães🇧🇷 · F. S. Navarra🇧🇷

    We investigate the interactions of the deuteron with light mesons during the hadronic phase in heavy-ion collisions. We treat the deuteron as a weakly bound state and employ the quasi-free approximation to describe the interaction. The underlying elementary amplitudes are described by a hybrid effective model, combining the non-resonant background from chiral perturbation theory with resonant contributions via Breit-Wigner parameterizations. These amplitudes are used to calculate the vacuum and thermally-averaged cross-sections for deuteron dissociation and production, namely, and the corresponding inverse reaction. We then use these cross sections in a rate equation to estimate the time evolution of the deuteron multiplicity. For the initial conditions we consider two models: the statistical hadronization model and the coalescence model, where the deuteron is treated as a hadronic molecule. Our findings suggest that the final deuteron yield does not retain a memory of its initial production mechanism.

    Comments:
    10 pages, 6 figures; Matches journal version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2510.17871 [pdf]
    PRD(2026)·0 citations
  2. 07

    [Submitted on 21 Oct 2025] (cross-list from astro-ph.HE)

    Binding energy of compact stars and their non-radial oscillations

    P. Laskos-Patkos🇬🇷 · S. Papadopoulos🇫🇷 · Ch. C. Moustakidis🇬🇷

    In the past years, a significant effort has been made with the scope of determining correlations, involving compact star properties, that are independent of the nuclear equation of state. Such universal relations are of utmost importance as they allow for the imposition of constraints on stellar properties without directly measuring them and they may also serve as a probe of General Relativity. In the present study, we investigated the possible existence of a universal relation between the binding energy of compact stars and the frequency of their non-radial oscillations. The main motivation was related to the fact that both of the aforementioned quantities might be measured in the occurrence of a supernova explosion. Interestingly, we found that there is a empirical relation between the oscillation frequency and the binding energy for both and modes, assuming hadronic stellar matter. The inclusion of hybrid equations of state, incorporating sharp phase transitions, was shown to result into deviations from the aforementioned quasi-universal relation.

    Comments:
    v1: 8 pages, 4 figures; v2: 8 pages, 4 figures; v3: 8 pages, 4 figures; updated to match the published version; accepted for publication in Physics Letters B
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
    arXiv:
    2510.18706 [pdf]
    PLB(2026)·0 citations

Affiliations

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