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Nuclear Theory·nucl-th

Wednesday·March 2, 2022

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 04

    [Submitted on 28 Feb 2022] (cross-list from quant-ph)

    Casimir effect in kinetic theory

    Xingyu Guo🇨🇳 · Jiaxing Zhao🇨🇳 · Pengfei Zhuang🇨🇳

    We study Casimir effect in equilibrium and non-equilibrium photon gas in the frame of quantum kinetic theory for gauge field. We derive first the transport, constraint and gauge fixing equations for the photon number distribution from Maxwell's equations, and then calculate the energy variation and Casimir force for a finite system by considering boundary condition on the surface of the system. The Casimir force in vacuum is suppressed by the thermal motion of photons in equilibrium state, when considering two adiabatic plates. In non-equilibrium state, the photon induced Casimir force oscillates and decays with time and finally disappears.

    Comments:
    5 pages, 2 figures. Accepted by New Journal of Physics
    Subjects:
    Quantum Physics (quant-ph); Nuclear Theory (nucl-th)
    arXiv:
    2202.13537 [pdf]
    New J.Phys.(2022)·1 citation
  2. 05

    [Submitted on 28 Feb 2022] (cross-list from hep-ph)

    QCD Analysis of Hadronic Parity Violation

    Susan Gardner🇺🇸 · Girish Muralidhara🇺🇸

    We present a QCD analysis of the effective weak Hamiltonian at hadronic energy scales for strangeness-nonchanging () hadronic processes. Performing a leading-order renormalization group analysis in QCD from the to the energy scale, we derive the pertinent effective Hamiltonian for hadronic parity violation, including the effects of both neutral and charged weak currents. We compute the complete renormalization group evolution of all isosectors and the evolution through heavy-flavor thresholds for the first time. We show that the additional four-quark operators that enter below the mass scale from QCD operator mixing effects form a closed set, and they result in a anomalous dimension matrix. Computing the resulting effective Hamiltonian and comparing to earlier results, we affirm the importance of operator mixing effects and find, as an example, that the parity-violating pion-nucleon coupling constant, using the factorization Ansatz and an assessment of the pertinent quark charge of the nucleon in lattice QCD at the 2 GeV scale, is in better agreement with recent experiments.

    Comments:
    13 pages, LaTeX, 2 figures; shortened to focus on error assessment in the effective Hamiltonian due, e.g., to scale and higher order in alpha_s uncertainties and in the parity-violating pion-nucleon coupling constant; references added; version to appear in PLB
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2203.00033 [pdf]
    PLB(2022)·9 citations
  3. 06

    [Submitted on 1 Mar 2022] (cross-list from physics.plasm-ph)

    Chandrasekhar-Kendall-Woltjer-Taylor state in a resistive plasma

    Ze-Yu Zhai · Yang-Guang Yang · Xiao-Liang Xia · Qun Wang

    We give a criterion for the Chandrasekhar-Kendall-Woltjer-Taylor (CKWT) state in a resistive plasma. We find that the lowest momentum (longest wavelength) of the initial helicity amplitudes of magnetic fields are the key to the CKWT state which can be reached if one helicity is favored over the other. This indicates that the imbalance between two helicities at the lowest momentum or longest wavelength in the initial conditions is essential to the CKWT state. A few examples of initial conditions for helicity amplitudes are taken to support the above statement both analytically and numerically.

    Comments:
    RevTex 4.1, 19 pages, 3 figures
    Subjects:
    Plasma Physics (physics.plasm-ph); Nuclear Theory (nucl-th)
    arXiv:
    2203.00230 [pdf]
    Plasma Phys.Control.Fusion(2022)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE