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Nuclear Theory·nucl-th

Tuesday·June 30, 2015

16 papers—11 primary·5 cross-listed

All16Primary11Cross-lists5
  1. 12

    [Submitted on 28 Jun 2015] (cross-list from hep-ph)

    New generation low-energy probes for ultralight axion and scalar dark matter

    Yevgeny V. Stadnik🇦🇺 · Victor V. Flambaum🇩🇪

    We present a brief overview of a new generation of high-precision laboratory and astrophysical measurements to search for ultralight (sub-eV) axion, axion-like pseudoscalar and scalar dark matter, which form either a coherent condensate or topological defects (solitons). In these new detection methods, the sought effects are linear in the interaction constant between dark matter and ordinary matter, which is in stark contrast to traditional searches for dark matter, where the sought effects are quadratic or higher order in the underlying interaction constants (which are extremely small).

    Comments:
    10 pages, Invited brief review for Modern Physics Letters A, Guest Editor: Maxim Yu. Khlopov
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Cosmology and Nongalactic Astrophysics (astro-ph.CO); Nuclear Theory (nucl-th); Atomic Physics (physics.atom-ph)
    arXiv:
    1506.08364 [pdf]
    Mod.Phys.Lett.A(2017)·17 citations
  2. 13

    [Submitted on 28 Jun 2015] (cross-list from hep-ph)

    Electromagnetic currents induced by color fields

    Naoto Tanji🇩🇪

    The quark production in classical color fields is investigated with a focus on the induction of an electromagnetic current by produced quarks. We show that the color SU(2) and the SU(3) theories lead significantly different results for the electromagnetic current. In uniform SU(2) color fields, the net electromagnetic current is not generated, while in SU(3) color fields the net current is induced depending on the color direction of background fields. Also the numerical study of the quark production in inhomogeneous color fields is done. Motivated by gauge field configurations provided by the color glass condensate framework, we introduce an ensemble of randomly distributed color electric fluxtubes. The spectrum of photons emitted from the quarks by a classical process is shown.

    Comments:
    19 pages, 19 figures; To appear in Phys. Rev. D
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1506.08442 [pdf]
    PRD(2015)·18 citations
  3. 14

    [Submitted on 29 Jun 2015] (cross-list from hep-ph)

    Collective neutrino oscillations and spontaneous symmetry breaking

    Huaiyu Duan (UNM)🇺🇸

    Neutrino oscillations in a hot and dense astrophysical environment such as a core-collapse supernova pose a challenging, seven-dimensional flavor transport problem. To make the problem even more difficult (and interesting), neutrinos can experience collective oscillations through nonlinear refraction in the dense neutrino medium in this environment. Significant progress has been made in the last decade towards the understanding of collective neutrino oscillations in various simplified neutrino gas models with imposed symmetries and reduced dimensions. However, a series of recent studies seem to have "reset" this progress by showing that these models may not be compatible with collective neutrino oscillations because the latter can break the symmetries spontaneously if they are not imposed. We review some of the key concepts of collective neutrino oscillations by using a few simple toy models. We also elucidate the breaking of spatial and directional symmetries in these models because of collective oscillations.

    Comments:
    18 pages, 4 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    1506.08629 [pdf]
    IJMPE(2015)·30 citations
  4. 15

    [Submitted on 29 Jun 2015] (cross-list from astro-ph.HE)

    Energy bursts from deconfinement in high-mass twin stars

    D. E. Alvarez-Castillo🇵🇱 · M. Bejger🇵🇱 · D. Blaschke🇵🇱 · P. Haensel🇵🇱 · L. Zdunik🇵🇱

    We estimate the energy reservoir available in the deconfinement phase transition induced collapse of a neutron star to its hybrid star mass twin on the "third family" branch, using a recent equation of state of dense matter. The available energy corresponding to the mass-energy difference between configurations is comparable with energies of the most violent astrophysical burst processes. An observational outcome of such a dynamical transition might be fast radio bursts, specifically a recent example of a FRB with a double-peak structure in its light curve.

    Comments:
    4 pages, 2 figures
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1506.08645 [pdf]
    9 citations
  5. 16

    [Submitted on 29 Jun 2015] (cross-list from hep-ph)

    Evolution of heavy quark distribution function in quark-gluon plasma: using the Iterative Laplace Transform Method

    Sharareh Mehrabi Pari🇮🇷 · Kurosh Javidan🇮🇷 · Fatemeh Taghavi Shahri🇮🇷

    The "Iterative Laplace Transform Method" is used to solve the Fokker-Planck equation for finding the time evolution of the heavy quarks distribution functions such as charm and bottom in quark gluon plasma. These solutions will lead us to calculation of nuclear suppression factor RAA. The results have good agreement with available experiment data from the PHENIX collaboration.

    Comments:
    13 pages, 4 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1506.08646 [pdf]
    EPJ Web Conf.(2016)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE