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Nuclear Theory·nucl-th

Friday·July 7, 2023

12 papers—2 primary·10 cross-listed

All12Primary2Cross-lists10
  1. 01

    [Submitted on 6 Jul 2023]

    Relativistic mean field model for ultra-compact low mass neutron star of HESS J1731-347

    Sebastian Kubis · Włodzimierz Wójcik · David Alvarez Castillo · Noemi Zabari

    The recent observation of the object HESS J1731-347 suggests the existence of a very light and very compact neutron star being a challenge for commonly used equation of state for dense matter. In this work we present a relativistic mean field model enriched with meson crossing terms among isovector and isoscalar mesons. Such interactions particularly dominate the behavior of the symmetry energy and accounts for small size of compact star radius. The proposed model fulfill the recent constraints concerning the symmetry energy slope and state-of-the-art compact stars constraints derived from the NICER measurements of PSR J0030+0451 and PSR J0740+6620 pulsars as well as from the GW170817 event and its associated electromagnetic counterparts AT2017gfo/GRB170817A.

    Comments:
    5 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
    arXiv:
    2307.02979 [pdf]
    PRC(2023)·31 citations
  2. 02

    [Submitted on 6 Jul 2023]

    Collective flow and the fluid behavior in p/d/He+Au collisions at GeV

    Zeming Wu🇨🇳 · Baochi Fu🇨🇳 · Shujun Zhao🇨🇳 · Runsheng Liu🇨🇳 · Huichao Song🇨🇳

    By varying the intrinsic initial geometry, the p/d/He+Au collisions at the Relativistic Heavy Ion Collider (RHIC) provide a unique opportunity to understand the collective behavior and probe the possible sub-nucleon fluctuations in small systems. In this paper, we employ the hybrid model iEBE-VISHNU with Trento initial conditions to study the collective flow and the fluid behavior in p/d/He+Au collisions. With fine-tuned parameters, iEBE-VISHNU can describe the and data from the PHENIX and STAR collaborations. However, for some certain parameter sets with initial sub-nucleon fluctuation, the hydrodynamic simulations have already beyond their limits with the average Knudsen number obviously larger than one. Our calculations demonstrate that, for a meaningful evaluation of the fluid behavior in the small systems, model simulations should also pay attention to the validity range of hydrodynamics.

    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2307.02995 [pdf]
    CPC(2024)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE