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Nuclear Theory·nucl-th

Monday·February 6, 2023

4 papers—1 primary·3 cross-listed

All4Primary1Cross-lists3
  1. 01

    [Submitted on 2 Feb 2023]

    Masses of compact (neutron) stars with distinguished cores

    Rico Zollner🇩🇪 · Minghui Ding🇩🇪 · Burkhard Kampfer🇩🇪

    The impact of the core mass on the compact/neutron-star mass-radius relation is studied. Besides the mass, the core is parameterized by its radius and surface pressure, which supports the outside one-component Standard Model (SM) matter. The core may accommodate SM matter with unspecified (or poorly known) equation-of-state or several components, e.g. consisting of admixtures of Dark Matter and/or Mirror World matter etc. beyond the SM. Thus, the admissible range of masses and radii of compact stars can be considerably extended.

    Comments:
    20 pages, 9 figures, 1 table. Contribution to a Special Issue of PARTICLES: "Strong Interactions in the Standard Model: Massless Bosons to Compact Stars". Version accepted for publication. arXiv admin note: text overlap with arXiv:2203.17228
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2302.01389 [pdf]
    Particles(2023)·10 citations
  2. 02

    [Submitted on 2 Feb 2023] (cross-list from hep-th)

    Linear stability analysis of Israel-Stewart theory in the case of a nonzero background charge

    Julia Sammet🇩🇪 · Markus Mayer🇩🇪 · Dirk H. Rischke🇩🇪

    Linear stability of Israel-Stewart theory in the presence of net-charge diffusion was investigated in [Phys.~Rev.~D 102 (2020) 116009] for the case of a massless, classical gas of noninteracting particles. However, in that work only a vanishing net-charge background was considered. In this work, we extend that study to the case of a nonvanishing background charge. We find that this effectively results in a change of the numeric value of the charge-diffusion coefficient, in a way that when the background charge goes to infinity, this coefficient can become at most four times its value at zero background charge. We also extend the analysis of [Phys.~Rev.~D 102 (2020) 116009] by performing a systematic parameter study in the plane of charge-diffusion coefficient vs.\ the coupling term between shear-stress and net-charge diffusion. In this plane, we identify regions where the solutions remain stable and causal and where they become acausal and/or unstable.

    Subjects:
    High Energy Physics — Theory (hep-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2302.01070 [pdf]
    PRD(2023)·16 citations
  3. 03

    [Submitted on 2 Feb 2023] (cross-list from hep-ph)

    Universality of Koba-Nielsen-Olesen scaling in QCD at high energy and entanglement

    Yizhuang Liu🇵🇱 · Maciej A. Nowak🇵🇱 · Ismail Zahed🇺🇸

    Using Mueller's dipole formalism for deep inelastic scattering in QCD, we formulate and solve the evolution for the generating function for the multiplicities of the produced particles, in hadronic processes at high energy. The solution for the multiplicities satisfies Koba-Nielsen-Olesen (KNO) scaling, with good agreement with the recently re-analyzed data from the H1 experiment at HERA (DESY), and the old ALEPH data for hadronic decay at LEP (CERN). The same scaling function with KNO scaling, carries to the hadronic multiplicities from jets in electron-positron annihilation. This agreement is {\it a priori} puzzling, since in Mueller's dipole evolution, one accounts for virtual dipoles in a wave function, whereas in electron-positron annihilation, one describes cross-sections of real particles. We explain the origin of this similarity, pointing at a particular duality between the two processes. Finally, we interpret our results from the point of view of quantum entanglement between slow and fast degrees of freedom in QCD, and derive the entanglement entropy pertinent to electron-positron annihilation into hadronic jets.

    Comments:
    6 pages, 1 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Theory (hep-th); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2302.01380 [pdf]
    19 citations
  4. 04

    [Submitted on 2 Feb 2023] (cross-list from nucl-ex)

    Studies of the equation-of-state of nuclear matter by heavy-ion collisions at intermediate energy in the multi-messenger era

    P. Russotto🇮🇹 · M.D. Cozma🇷🇴 · E. De Filippo🇮🇹 · A. Le Fèvre🇩🇪 · Y. Leifels🇩🇪 · J. Łukasik🇵🇱

    The study of the equation-of-state (EoS) describing the properties of nuclear matter away from the normal conditions is a relevant and intriguing topic of modern nuclear physics. The last decades have witnessed a substantial experimental progress in derivation of the symmetric matter term of the EoS and of the so-called symmetry energy for the asymmetric matter, especially at densities below the saturation point. But it is only in recent years that the opening of the multi-messenger astronomy era, triggered by detection of gravitational waves due to the neutron star mergers, has renewed and enlarged the interest in high-density EoS, being the main ingredient for determining the structure and properties of neutron stars. In this paper we review our knowledge obtained from heavy-ion collisions up to the 1 GeV/nucleon regime, on the EoS above nuclear saturation density. Special emphasis is given on the still few results on symmetry energy at high densities and their interconnections with multi-messenger astronomy findings.

    Comments:
    79 pages, 25 figures
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2302.01453 [pdf]
    Riv.Nuovo Cim.(2023)·20 citations

Affiliations

first authorsco-authorsvia INSPIRE