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Nuclear Theory·nucl-th

Friday·March 31, 2023

10 papers—5 primary·5 cross-listed

All10Primary5Cross-lists5
  1. 01

    [Submitted on 29 Mar 2023]

    Theoretical and Experimental Constraints for the Equation of State of Dense and Hot Matter

    Rajesh Kumar🇺🇸 · Veronica Dexheimer🇺🇸 · Johannes Jahan🇺🇸 · Jorge Noronha🇺🇸 · Jacquelyn Noronha-Hostler🇺🇸 · Claudia Ratti🇺🇸 · Nico Yunes🇺🇸 · Angel Rodrigo Nava Acuna🇺🇸 · Mark Alford🇺🇸 · Mahmudul Hasan Anik🇺🇸 · Debarati Chatterjee🇮🇳 · Katerina Chatziioannou🇺🇸 and 48 other authors

    This review aims at providing an extensive discussion of modern constraints relevant for dense and hot strongly interacting matter. It includes theoretical first-principle results from lattice and perturbative QCD, as well as chiral effective field theory results. From the experimental side, it includes heavy-ion collision and low-energy nuclear physics results, as well as observations from neutron stars and their mergers. The validity of different constraints, concerning specific conditions and ranges of applicability, is also provided.

    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2303.17021 [pdf]
    Living Rev.Rel.(2024)·171 citations
  2. 02

    [Submitted on 30 Mar 2023]

    Probing into the Possible Range of the U Bosonic Coupling Constants in Neutron Stars Containing Hyperons

    Yan Xu🇨🇳 · Bin Diao🇨🇳 · Yi-Bo Wang🇨🇳 · Xiu-Lin Huang🇨🇳 · Xing-Xing Hu🇨🇳 · Zi Yu🇨🇳

    The range of the U bosonic coupling constants in neutron star matter is a very interesting but still unsolved problem which has multifaceted influences in nuclear physics, particle physics, astrophysics and cosmology. The combination of the theoretical numerical simulation and the recent observations provides a very good opportunity to solve this problem. In the present work, the range of the U bosonic coupling constants is inferred based on the three relations of the mass-radius, mass-frequency and mass-tidal deformability in neutron star containing hyperons using the GM1, TM1 and NL3 parameter sets under the two flavor symmetries of the SU(6) and SU(3) in the framework of the relativistic mean field theory. Combined with observations from PSRs J1614-2230, J0348+0432, J2215-5135, J0952-0607, J0740+6620, J0030-0451, J1748-2446ad, XTE J1739-285, GW170817 and GW190814 events, our numerical results show that the U bosonic coupling constants may tend to be within the range from 0 to 20 GeV in neutron star containing hyperons. Moreover, the numerical results of the three relations obtained by the SU(3) symmetry are better in accordance with observation data than those obtained by the SU(6) symmetry. The results will help us to improve the strict constraints of the equation of state for neutron stars containing hyperons.

    Comments:
    14pages,4figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
    arXiv:
    2303.17106 [pdf]
    Res.Astron.Astrophys.(2023)·7 citations
  3. 03

    [Submitted on 30 Mar 2023]

    A Deep Learning Approach to Extracting Nuclear Matter Properties from Neutron Star Observations

    Plamen G. Krastev (Harvard University)🇺🇸

    Understanding the equation of state of dense QCD matter remains a major challenge in both nuclear physics and astrophysics. Neutron star observations from electromagnetic and gravitational wave spectra provide critical insights into the behavior of dense neutron-rich matter. The next generation of telescopes and gravitational wave observatories will offer even more detailed observations of neutron stars. Utilizing deep learning techniques to map neutron star mass and radius observations to the equation of state allows for its accurate and reliable determination. This work demonstrates the feasibility of using deep learning to extract the equation of state directly from neutron star observational data, and to also obtain related nuclear matter properties such as the slope, curvature, and skewness of the nuclear symmetry energy at saturation density. Most importantly, we show that this deep learning approach is able to reconstruct \textit{realistic} equations of state, and deduce \textit{realistic} nuclear matter properties. This highlights the potential of artificial neural networks in providing a reliable and efficient means to extract crucial information about the equation of state and related properties of dense neutron-rich matter in the era of multi-messenger astrophysics.

    Comments:
    22 pages, 12 figures, 4 tables. Invited article for Symmetry for the Special Issue "Symmetries and Ultra Dense Matter of Compact Stars"
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Experiment (nucl-ex)
    arXiv:
    2303.17146 [pdf]
    Symmetry(2023)·28 citations
  4. 04

    [Submitted on 30 Mar 2023]

    Effective field theory with resonant P-wave interaction

    Qingfeng Li · Songlin Lyu · Chen Ji · Bingwei Long

    A new effective field theory has been developed to describe shallow -wave resonances using nonlocal, momentum-dependent two-body potentials. This approach is expected to facilitate many-body calculations and has been demonstrated to converge and to be renormalizable in perturbative calculations at subleading orders. The theory has been applied to the neutron-alpha system, with good agreement found between its predictions and a phase-shift analysis of neutron-alpha elastic scattering. In the three-body system consisting of two neutrons and an alpha particle, the nonlocal potential in this framework has been found to recover the same qualitative features as previously shown with energy-dependent formulations.

    Comments:
    18 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2303.17292 [pdf]
    PRC(2023)·7 citations
  5. 05

    [Submitted on 30 Mar 2023]

    Cumulants from fluctuating width of rapidity distribution

    Michał Barej🇵🇱 · Adam Bzdak🇵🇱

    In relativistic heavy-ion collisions, the longitudinal fluctuations of the fireball density caused, e.g., by baryon stopping fluctuations result in event-by-event modifications of the shape of the proton rapidity density distribution. The multiparticle rapidity correlation functions due to the varying distribution width of the proton rapidity density in central Au+Au collisions at low energies are derived. The cumulant ratios are calculated and discussed in the context of the recent STAR Collaboration results. We find that the cumulant ratios for small width fluctuations seem to be universal.

    Comments:
    24 pages, 11 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2303.17417 [pdf]
    PRC(2023)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE