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Nuclear Theory·nucl-th

Friday·July 15, 2022

7 papers—2 primary·5 cross-listed

All7Primary2Cross-lists5
  1. 01

    [Submitted on 14 Jul 2022]

    Trace anomaly as signature of conformality in neutron stars

    Yuki Fujimoto🇺🇸 · Kenji Fukushima🇯🇵 · Larry D. McLerran🇺🇸 · Michal Praszalowicz🇵🇱

    We discuss an interpretation that a peak in the sound velocity in neutron star matter, as suggested by the observational data, signifies strongly-coupled conformal matter. The normalized trace anomaly is a dimensionless measure of conformality leading to the derivative and the non-derivative contributions to the sound velocity. We find that the peak in the sound velocity is attributed to the derivative contribution from the trace anomaly that steeply approaches the conformal limit. Smooth continuity to the behavior of high-density QCD implies that the matter part of the trace anomaly may be positive definite. We discuss a possible implication of the positivity condition of the trace anomaly on the - relation of the neutron stars.

    Comments:
    6 pages, 3 figures; accepted in PRL
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2207.06753 [pdf]
    PRL(2022)·183 citations
  2. 02

    [Submitted on 14 Jul 2022]

    Dynamical Pair Production at Sub-Barrier Energies for Light Nuclei

    T. Settlemyre · H. Zheng · A. Bonasera

    In the collision of two heavy ions, the strong repulsion coming from the Coulomb field is enough to produce pair(s) from vacuum fluctuations. The energy is provided by the kinetic energy of the ions and the Coulomb interaction at the production point. If, for instance, the electron is located at the center of mass (C.M.) of the two ions moving along the \emph{z}-axis, and the positron is at a distance \emph{x} from the electron, the ions can be accelerated towards each other since the Coulomb barrier is lowered by the presence of the electron. This screening results in an increase in the kinetic energy of the colliding ions and may result in an increase in the fusion probability of light ions above the adiabatic limit.

    Comments:
    6 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2207.06900 [pdf]
    Particles(2022)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE