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Nuclear Theory·nucl-th

Friday·April 12, 2019

6 papers—2 primary·4 cross-listed

All6Primary2Cross-lists4
  1. 03

    [Submitted on 11 Apr 2019] (cross-list from hep-ph)

    Non-static Analysis of the Anomalous Chiral Conductivities

    Miklos Horvath🇨🇳 · Defu Hou🇨🇳 · Hai-cang Ren🇺🇸

    Given the intrinsic nonequilibrium nature of high-energy collisions the investigation of the dynamical properties of transport phenomena is important. The study of the real-time behavior of various conductivities and susceptibilities help refine the simulation tools we use to compare the theories and the experimental findings. In this contribution we take steps to give the chiral magnetic conductivity in case of magnetic field and chiral imbalance are both space-time dependent. Using linear response approximation we present the general 1-loop resummed expression for the electric current. We also suggest simple limiting cases in hope for possible implementation into a hydrodynamical framework.

    Comments:
    5 pages, 2 figures; contribution to the proceedings of the 8th International Conference on Quarks and Nuclear Physics (QNP2018), Tsukuba, November 13-17, 2018
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1904.05520 [pdf]
    JPS Conf.Proc.(2019)·0 citations
  2. 04

    [Submitted on 11 Apr 2019] (cross-list from hep-ph)

    Proton Internal Pressure in and Elastic Scattering

    S. D. Campos🇧🇷

    In this work, one proposes the use of a damped confinement potential to mimic the proton internal energy. The internal pressure is calculated taking into account the occurrence of a phase transition in the and total cross section. The model predicts the inversion of the positive and negative pressure regions depending on the squared energy , where the total cross section achieves its minimum value. Considering energies below the phase transition the expected results are in accordance with the recent proton internal pressure measurement. For energies above , the model predicts a negative pressure region near the center of the hadron surrounded by a positive pressure region.

    Comments:
    A version of this paper was accepted for publication in the International Journal of Modern Physics A
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1904.05708 [pdf]
    Int.J.Mod.Phys.A(2019)·3 citations
  3. 05

    [Submitted on 9 Apr 2019] (cross-list from astro-ph.HE)

    Born-Infeld magnetars: larger production of gravitational waves due to larger toroidal magnetic fields

    Jonas P. Pereira🇧🇷 · Jaziel G. Coelho🇧🇷 · Rafael C. R. de Lima🇧🇷

    We discuss some aspects of Pereira et al. (2018) concerning magnetars described by nonlinear theories of the electromagnetism and make the case for the Born-Infeld Lagrangian. We focus on the increase of toroidal magnetic fields in these systems with respect to ordinary magnetars and the subsequent increase of gravitational wave production. In summary, nonlinear theories of the electromagnetism would make it more likely for the detection of gravitational waves with future detectors, which could constrain nonlinear aspects of electrodynamics not entirely possible on Earth-based particle accelerators.

    Comments:
    Contribution to the Proceedings of the VIII International Workshop on Astronomy and Relativistic Astrophysics - IWARA 2018
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    1904.05753 [pdf]
    0 citations
  4. 06

    [Submitted on 11 Apr 2019] (cross-list from nucl-ex)

    A New Approach to Determine Radiative Capture Reaction Rates at Astrophysical Energies

    I. Friščić · T. W. Donnelly · R. G. Milner

    Radiative capture reactions play a crucial role in stellar nucleosynthesis but have proved challenging to determine experimentally. In particular, the large uncertainty (100%) in the measured rate of the CO reaction is the largest source of uncertainty in any stellar evolution model. With development of new high current energy-recovery linear accelerators (ERLs) and high density gas targets, measurement of the OC reaction close to threshold using detailed balance opens up a new approach to determine the CO reaction rate with significantly increased precision (20%). We present the formalism to relate photo- and electro-disintegration reactions and consider the design of an optimal experiment to deliver increased precision. Once the new ERLs come online, an experiment to validate the new approach we propose should be carried out. This new approach has broad applicability to radiative capture reactions in astrophysics.

    Comments:
    38 pages, 27 figures, version 2
    Subjects:
    Nuclear Experiment (nucl-ex); Solar and Stellar Astrophysics (astro-ph.SR); Nuclear Theory (nucl-th)
    arXiv:
    1904.05819 [pdf]
    J.Phys.Conf.Ser.(2020)·18 citations

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first authorsco-authorsvia INSPIRE