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Nuclear Theory·nucl-th

Friday·September 22, 2023

3 papers—1 primary·2 cross-listed

All3Primary1Cross-lists2
  1. 01

    [Submitted on 21 Sept 2023]

    Nuclear viscosity estimated by dynamics of neck formation in the early stage of nuclear collision

    S. Amano · Y. Aritomo · M. Ohta

    The very early stage of the coalescence of two nuclei is studied and used to estimate the nuclear viscosity. The time evolution of the neck region has been simulated by the unified Langevin equation method, which is used in the analysis of heavy-ion collisions from the approaching stage to the fusion-fission stage. It is found that the transition from viscous to inertial coalescence that appeared in the neck growth of macroscopic drops can also be seen in the present simulation in nucleus-nucleus collisions. The dynamics of neck growth is analyzed in terms of the hydrodynamical formula and the viscosity coefficient of nuclear matter is estimated using the analogy of macroscopic drops.

    Comments:
    14 pages 6 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2309.11771 [pdf]
    Mod.Phys.Lett.A(2023)·2 citations
  2. 02

    [Submitted on 21 Sept 2023] (cross-list from hep-th)

    Stability and causality criteria in linear mode analysis: stability means causality

    Dong-Lin Wang🇨🇳 · Shi Pu🇨🇳

    Causality and stability are fundamental requirements for the differential equations describing predictable relativistic many-body systems. In this work, we investigate the stability and causality criteria in linear mode analysis. We discuss the updated stability criterion in 3+1 dimensional systems and introduce the improved sufficient criterion for causality. Our findings clearly demonstrate that stability implies causality in linear mode analysis. Furthermore, based on the theorems present in this work, we conclude that if updated stability criterion and improved causality criterion are fulfilled in one inertial frame of reference (IFR), they hold for all IFR.

    Comments:
    6+8 pages, 1 figure; references added, typos corrected
    Subjects:
    High Energy Physics — Theory (hep-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2309.11708 [pdf]
    PRD(2024)·30 citations
  3. 03

    [Submitted on 21 Sept 2023] (cross-list from hep-ph)

    Heavy and baryons in the quark model

    Emmanuel Ortiz-Pacheco🇸🇮 · Roelof Bijker🇲🇽

    We present a study of the low-lying and baryon states based on masses, strong and radiative decays. In a harmonic oscillator quark model analysis it is found that the majority of the detected states can be interpreted as - and -wave excitations.

    Comments:
    7 pages, 2 figures, 6 tables, to be published in J. Phys. Conf. Ser. (2023)
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2309.12266 [pdf]
    J.Phys.Conf.Ser.(2023)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE