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Nuclear Theory·nucl-th

Monday·May 20, 2024

7 papers—5 primary·2 cross-listed

All7Primary5Cross-lists2
  1. 06

    [Submitted on 16 May 2024] (cross-list from hep-ph)

    Analytical insights into the interplay of momentum, multiplicity and the speed of sound in heavy-ion collisions

    Gabriel Soares Rocha🇺🇸 · Lorenzo Gavassino🇺🇸 · Mayank Singh🇺🇸 · Jean-François Paquet🇺🇸

    We introduce a minimal model of ultracentral heavy-ion collisions to study the relation between the speed of sound of the produced plasma and the final particles' energy and multiplicity. We discuss how the particles' multiplicity and average energy is related to the speed of sound by if the fluid is inviscid, its speed of sound is constant and all final particles can be measured. We show that finite rapidity cuts on the particles' multiplicity and energy introduce corrections between and that depend on the system's lifetime. We study analytically these deviations with the Gubser hydrodynamic solution, finding that, for ultrarelativistic bosons, they scale as the ratio of the freezeout temperature over the maximum initial temperature of the fluid ; the non-thermodynamic aspect of these corrections is highlighted through their dependence on the system's initial conditions.

    Comments:
    21 pages, 8 figures, v2 -- published version, associated git-hub repository: https://github.com/gabriel-sr151/cylindrical-sym-CF
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2405.10401 [pdf]
    PRC(2024)·8 citations
  2. 07

    [Submitted on 16 May 2024] (cross-list from astro-ph.SR)

    Solar Models and Astrophysical S-factors Constrained by Helioseismic Results and Updated Neutrino Fluxes

    Wuming Yang · Zhijia Tian

    The ratio of metal abundance to hydrogen abundance of the solar photosphere, , has been revised several times. Standard solar models, based on these revised solar abundances, are in disagreement with seismically inferred results. Recently, Magg et al. introduced a new value for , which is still in debate in the community. The solar abundance problem or solar modeling problem remains a topic of ongoing debate. We constructed rotating solar models in accordance with various abundance scales where the effects of convection overshoot and enhanced diffusion were included. Among these models, those utilizing Magg's abundance scale exhibit superior sound-speed and density profiles compared to models using other abundance scales. Additionally, they reproduce the observed frequency separation ratios and . These models also match the seismically inferred surface helium abundance and convection zone depth within level. Furthermore, the calculated neutrino fluxes from these models agree with detected ones at the level of . We found that neutrino fluxes and density profile are influenced by nuclear reactions, allowing us to use the combination of detected neutrino fluxes and seismically inferred density for diagnosing astrophysical -factors. This diagnostic approach shows that may be underestimated by , while may be overestimated by about in previous determinations. The -factors favored by updated neutrino fluxes and helioseismic results can lead to significant improvements in solar models.

    Comments:
    Accepted for publication in ApJ, 29 pages, 9 figures, 5 tables
    Subjects:
    Solar and Stellar Astrophysics (astro-ph.SR); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    2405.10472 [pdf]
    ApJ(2024)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE