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Nuclear Theory·nucl-th

Wednesday·January 25, 2023

4 papers—3 primary·1 cross-listed

All4Primary3Cross-lists1
  1. 01

    [Submitted on 23 Jan 2023]

    Bayesian refinement of covariant energy density functionals

    Marc Salinas · J. Piekarewicz

    The last five years have seen remarkable progress in our quest to determine the equation of state of neutron rich matter. Recent advances across the theoretical, experimental, and observational landscape have been incorporated in a Bayesian framework to refine existing covariant energy density functionals previously calibrated by the properties of finite nuclei. In particular, constraints on the maximum neutron star mass from pulsar timing, on stellar radii from the NICER mission, on tidal deformabilities from the LIGO-Virgo collaboration, and on the dynamics of pure neutron matter as predicted from chiral effective field theories, have resulted in significant refinements to the models, particularly to those predicting a stiff symmetry energy. Still, even after these improvements, we find challenging to reproduce simultaneously the neutron skin thickness of both Pb and Ca recently reported by the PREX/CREX collaboration.

    Comments:
    16 pages, 7 Figures, 3 Tables
    Subjects:
    Nuclear Theory (nucl-th); Solar and Stellar Astrophysics (astro-ph.SR); Nuclear Experiment (nucl-ex)
    arXiv:
    2301.09692 [pdf]
    PRC(2023)·27 citations
  2. 02

    [Submitted on 24 Jan 2023]

    Fluctuations near the liquid-gas and chiral phase transitions in hadronic matter

    Michał Marczenko🇵🇱 · Krzysztof Redlich🇵🇱 · Chihiro Sasaki🇵🇱

    We investigate the fluctuations of the net-baryon number density in dense hadronic matter. Chiral dynamics is modeled via the parity doublet Lagrangian, and the mean-field approximation is employed to account for chiral criticality. We focus on the qualitative properties and systematics of the second-order susceptibility of the net-baryon number density for individual positive- and negative-parity nucleons whose masses become degenerate at the chiral restoration. It is shown that the second-order susceptibility of the positive-parity state can become negative when the chiral symmetry is restored, as a natural consequence of the unique relationship of the mass to the order parameter. Moreover, we find that such negative fluctuations are indicative of approaching the critical point on the chiral phase boundary. Our results may have consequences for the interpretation of the experimental data on net-proton fluctuations in heavy-ion collisions.

    Comments:
    Version accepted for publication in Phys. Rev. D. arXiv admin note: substantial text overlap with arXiv:2012.15535
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2301.09866 [pdf]
    PRD(2023)·14 citations
  3. 03

    [Submitted on 24 Jan 2023]

    Temperature of the hot -source: a guidance to probe the Bose-Einstein condensation of clusters in the heavy-ion collision

    Jun Su🇨🇳 · Long Zhu🇨🇳

    Recent experimental efforts were made to explore the Bose-Einstein condensation in multi- system using the heavy-ion collisions. This Letter provides a explanation why no signatures were observed and a guidance for future experiments. More precisely, a harmonic oscillator model is developed to study the multi- source at or near zero temperature. The temperature and particle population of the multi- sources observed in the current experiments are extracted. It is found that almost no particles occupy the ground state in those multi- sources. The critical temperature for the multi--condensed states are predicted, which provides a guidance for the future experiments to probe the Bose-Einstein condensation of clusters in the heavy-ion collisions.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2301.09872 [pdf]
    PLB(2023)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE