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Nuclear Theory·nucl-th

Monday·August 30, 2021

12 papers—7 primary·5 cross-listed

All12Primary7Cross-lists5
  1. 08

    [Submitted on 26 Aug 2021] (cross-list from physics.plasm-ph)

    Ion Heat and Parallel Momentum Transport by Stochastic Magnetic Fields and Turbulence

    Chang-Chun Chen · Patrick H. Diamond · Steven M. Tobias

    The theory of turbulent transport of parallel momentum and ion heat by the interaction of stochastic magnetic fields and turbulence is presented. Attention is focused on determining the kinetic stress and the compressive energy flux. A critical parameter is identified as the ratio of the turbulent scattering rate to the rate of parallel acoustic dispersion. For the parameter large, the kinetic stress takes the form of a viscous stress. For the parameter small, the quasilinear residual stress is recovered. In practice, the viscous stress is the relevant form, and the quasilinear limit is not observable. This is the principal prediction of this paper. A simple physical picture is developed and shown to recover the results of the detailed analysis.

    Comments:
    16 pages, 5 figures, PPCF invited paper
    Subjects:
    Plasma Physics (physics.plasm-ph); Nuclear Theory (nucl-th); Fluid Dynamics (physics.flu-dyn)
    arXiv:
    2108.12066 [pdf]
    Plasma Phys.Control.Fusion(2022)·0 citations
  2. 09

    [Submitted on 27 Aug 2021] (cross-list from hep-ph)

    Transverse Momentum and Transverse Momentum Distributions in the MIT Bag Model

    A. I. Signal🇳🇿 · F. G. Cao🇳🇿

    The typical transverse momentum of a quark in the proton is a basic property of any QCD based model of nucleon structure. However, calculations in phenomenological models typically give rather small values of transverse momenta, which are difficult to reconcile with the larger values observed in high energy experiments such as Drell-Yan reactions and Semi-inclusive deep inelastic scattering. In this letter we calculate the leading twist transverse momentum dependent distribution functions (TMDs) using a generalization of the Adelaide group's relativistic formalism that has previously given good fits to the parton distributions. This enables us to examine the dependence of the TMDs in detail, and determine typical widths of these distributions. These are found to be significantly larger than those of previous calculations. We then use TMD factorization in order to evolve these distributions up to experimental scales where we can compare with data on and . Our distributions agree well with this data.

    Comments:
    17 pages, 4 figures. Final version, accepted for publication in Physics Letters B
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2108.12116 [pdf]
    PLB(2022)·13 citations
  3. 10

    [Submitted on 27 Aug 2021] (cross-list from quant-ph)

    QCD Factorization and Quantum Mechanics

    C. A. Aidala🇺🇸 · T. C. Rogers🇺🇸

    It is unusual to find QCD factorization explained in the language of quantum information science. However, we will discuss how the issue of factorization and its breaking in high-energy QCD processes relates to phenomena like decoherence and entanglement. We will elaborate with several examples and explain them in terms familiar from basic quantum mechanics and quantum information science.

    Comments:
    12 pages, 9 figures. Invited manuscript for Philosophical Transactions of the Royal Society A
    Subjects:
    Quantum Physics (quant-ph); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2108.12319 [pdf]
    Phil.Trans.A.Math.Phys.Eng.Sci.(2021)·7 citations
  4. 11

    [Submitted on 27 Aug 2021] (cross-list from hep-ph)

    Quantum fluctuation in an inhomogeneous background and its influence on the phase transition in a finite volume system

    Xiaogang Li🇨🇳 · Song Shu🇨🇳 · Jia-Rong Li🇨🇳

    We have studied the grand potential and phase transitions of an inhomogeneous finite volume spherical quark system. First the finite volume effects are considered by applying the multiple reflection expansion method which is an approximation for the density of states of the momentum in the grand potential of the finite size system. Then, the density of states of momentum is further modified by the thermal fluctuations in the thermal system with the inhomogeneous field background. The modification of the density of states is calculated by the scattering phase shift from the Dirac equation of quarks in the inhomogeneous field background. By the numerical calculation we show how the phase transition is changed by varying the configuration of the inhomogeneous field background and find that the strong first order phase transition could be weakened or even changed to a crossover as a result.

    Comments:
    13 pages, 12 figures. Some sentences and typos corrected, 2 new plots, matches published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2108.12325 [pdf]
    PRC(2022)·6 citations
  5. 12

    [Submitted on 27 Aug 2021] (cross-list from gr-qc)

    Uncertainty limits on neutron star radius measurements with gravitational waves

    Katerina Chatziioannou🇺🇸

    Upcoming observing campaigns with improved detectors will yield numerous detections of gravitational waves from neutron star binary inspirals. Rare loud signals together with numerous signals of moderate strength promise stringent constraints on the properties of neutron star matter, with a projected radius statistical uncertainty of m with sources. Given this precision we revisit all analysis assumptions and identify sources of systematic errors, quantify their impact on radius extraction, and discuss their relative importance and ways to mitigate them.

    Comments:
    5 pages, 3 figures, published version
    Subjects:
    General Relativity and Quantum Cosmology (gr-qc); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    2108.12368 [pdf]
    PRD(2022)·74 citations

Affiliations

first authorsco-authorsvia INSPIRE