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Nuclear Theory·nucl-th

Friday·August 21, 2015

12 papers—8 primary·4 cross-listed

All12Primary8Cross-lists4
  1. 09

    [Submitted on 18 Aug 2015] (cross-list from cond-mat.mes-hall)

    Generalized Landau level representation: Effect of static screening in the quantum Hall effect in graphene

    Igor A. Shovkovy🇺🇸 · Lifang Xia🇺🇸

    By making use of the generalized Landau level representation (GLLR) for the quasiparticle propagator, we study the effect of screening on the properties of the quantum Hall states with integer filling factors in graphene. The analysis is performed in the low-energy Dirac model in the mean-field approximation, in which the long-range Coulomb interaction is modified by the one-loop static screening effects in the presence of a background magnetic field. By utilizing a rather general ansatz for the propagator, in which all dynamical parameters are running functions of the Landau level index , we derive a self-consistent set of the Schwinger-Dyson (gap) equations and solve them numerically. The explicit solutions demonstrate that static screening leads to a substantial suppression of the gap parameters in the quantum Hall states with a broken flavor symmetry. The temperature dependence of the energy gaps is also studied. The corresponding results mimic well the temperature dependence of the activation energies measured in experiment. It is also argued that, in principle, the Landau level running of the quasiparticle dynamical parameters could be measured via optical studies of the integer quantum Hall states.

    Comments:
    18 pages, 6 multi-panel figures; v2: published version with extended discussions and several new references
    Subjects:
    Mesoscale and Nanoscale Physics (cond-mat.mes-hall); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1508.04471 [pdf]
    PRB(2016)·2 citations
  2. 10

    [Submitted on 20 Aug 2015] (cross-list from hep-ph)

    The Effects of Superhigh Magnetic Fields on Equations of States of Neutron Stars

    Z.F.Gao🇨🇳 · N.Wang🇨🇳 · Y.Xu · H.Shan🇨🇳 · X.D.Li🇨🇳

    By introducing Dirac ?-function in superhigh magnetic field, we deduce a general formula for pressure of degenerate and relativistic electrons, Pe, which is suitable for superhigh magnetic fields, discuss the quantization of Landau levels of electrons, and consider the quantum electrodynamic(QED) effects on the equations of states (EOSs) for different matter systems. The main conclusions are as follows: the stronger the magnetic field strength, the higher the electron pressure becomes; compared with a common radio pulsar, a magnetar could be a more compact oblate spheroid-like deformed neutron star due to the anisotropic total pressure; and an increase in the maximum mass of a magnetar is expected because of the positive contribution of the magnetic field energy to the EOS of the star. Since this is an original work in which some uncertainties could exist, to further modify and perfect our theory model should be considered in our future studies.

    Comments:
    arXiv admin note: substantial text overlap with arXiv:1312.1442
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    1508.04860 [pdf]
    Astron.Nachr.(2015)·18 citations
  3. 11

    [Submitted on 20 Aug 2015] (cross-list from nucl-ex)

    Short-range correlations and their implications for isospin-dependent modification of nuclear quark distributions

    John Arrington🇺🇸

    The past decade has provided a much clearer picture of the structure of high-momentum components in nucleons, associated with hard, short-distance interactions between pairs of nucleons. Recent Jefferson Lab data on light nuclei suggest a connection between these so-called 'short-range correlations' and the modification of the quark structure of nucleons in the nuclear environment. In light of this discovery that the detailed nuclear structure is important in describing the nuclear quark distributions, we examine the potential impact of the isospin-dependent structure of nuclei to see at what level this might yield flavor-dependent effects in nuclear quark distributions.

    Comments:
    10 pages, 2 figures, proceedings from the 21st international conference on few-body physics
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1508.05042 [pdf]
    EPJ Web Conf.(2016)·12 citations
  4. 12

    [Submitted on 20 Aug 2015] (cross-list from hep-ph)

    Correct Definition of the Gluon Fragmentation Function at High Energy Colliders

    Gouranga C. Nayak

    Since the definition of the gluon to hadrons fragmentation amplitude involves gluon field corresponding to single gluon incoming state , the present definition of the gluon fragmentation function at high energy colliders [which involves non-abelian field tensor instead of in the initial state] is not consistent with the single gluon incoming state . In this paper we derive the correct definition of the gluon fragmentation function at high energy colliders from first principles which is obtained from the single gluon incoming state and is gauge invariant and is consistent with the factorization theorem in QCD.

    Comments:
    13 pages latex. arXiv admin note: substantial text overlap with arXiv:1506.02651, arXiv:1506.02593, arXiv:1508.01194
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1508.05078 [pdf]
    2 citations

Affiliations

first authorsco-authorsvia INSPIRE