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Nuclear Theory·nucl-th

Friday·September 4, 2015

7 papers—4 primary·3 cross-listed

All7Primary4Cross-lists3
  1. 01

    [Submitted on 2 Sept 2015]

    Advances in the ab initio description of nuclear three-cluster systems

    Carolina Romero-Redondo🇺🇸 · Sofia Quaglioni🇺🇸 · Petr Navrátil🇨🇦 · Guillaume Hupin🇫🇷

    We introduce the extension of the ab initio no-core shell model with continuum to describe three-body cluster systems. We present results for the ground state of 6He and show improvements with respect to the description obtained within the no-core shell model and the no-core shell model/resonating group methods.

    Comments:
    Proceedings of the 21st International Conference on Few-Body Problems in Physics. May 18-22, 2015. Chicago, Illinois, USA
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1509.00878 [pdf]
    EPJ Web Conf.(2016)·0 citations
  2. 02

    [Submitted on 3 Sept 2015]

    Relativistic few-body methods

    Wayne Polyzou🇺🇸

    I discuss the role of relativistic quantum mechanics in few-body physics, various formulations of relativistic few-body quantum mechanics and how they are related.

    Comments:
    Contribution to the \it 21-st International Conference on Few-Body Problems in Physics, 8 pages, 2 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Theory (hep-th)
    arXiv:
    1509.00928 [pdf]
    EPJ Web Conf.(2016)·2 citations
  3. 03

    [Submitted on 3 Sept 2015]

    Towards an ab initio description of the light-nuclei radiative captures

    Jérémy Dohet-Eraly · Petr Navrátil · Sofia Quaglioni · Wataru Horiuchi · Guillaume Hupin

    The and astrophysical factors are evaluated at low collision energies (less than 2.5 MeV in the centre-of-mass frame) within the no-core shell model with continuum approach using a renormalized chiral nucleon-nucleon interaction.

    Comments:
    4 pages, submitted as a proceeding of the 21st International Conference on Few-Body Problems in Physics
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1509.00971 [pdf]
    EPJ Web Conf.(2016)·3 citations
  4. 04

    [Submitted on 3 Sept 2015]

    Two neutron decay of 16Be

    A.E. Lovell · F.M. Nunes · I.J. Thompson

    Recently, the first example of two-neutron decay from the ground state of an unbound nucleus, Be, was seen. Three-body methods are ideal for exactly treating the degrees of freedom important for these decays. Using a basis expansion over hyperspherical harmonics and the hyperspherical R-matrix method, we construct a realistic model of Be in order to investigate its decay mode and the role of the two-neutron interaction. The neutron-Be interaction is constrained using shell model predictions. We obtain a ground state for Be that is over-bound by approximately 1 MeV with a width of approximately 0.23 MeV. This suggests, that for such systems, the three-body force needs to be repulsive.

    Comments:
    4 pages, 1 figure, contribution to the proceedings for the 21st International Conference on Few Body Problems in Physics, Chicago, Illinois, USA
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1509.01193 [pdf]
    EPJ Web Conf.(2016)·0 citations
  5. 05

    [Submitted on 3 Sept 2015] (cross-list from physics.atom-ph)

    Manifestations of dark matter and variations of fundamental constants in atoms and astrophysical phenomena

    Y. V. Stadnik🇦🇺 · V. V. Flambaum🇩🇪

    We present an overview of recent developments in the detection of light bosonic dark matter, including axion, pseudoscalar axion-like and scalar dark matter, which form either a coherently oscillating classical field or topological defects (solitons). We emphasise new high-precision laboratory and astrophysical measurements, in which the sought effects are linear in the underlying interaction strength between dark matter and ordinary matter, in contrast to traditional detection schemes for dark matter, where the effects are quadratic or higher order in the underlying interaction parameters and are extremely small. New terrestrial experiments include measurements with atomic clocks, spectroscopy, atomic and solid-state magnetometry, torsion pendula, ultracold neutrons, and laser interferometry. New astrophysical observations include pulsar timing, cosmic radiation lensing, Big Bang nucleosynthesis and cosmic microwave background measurements. We also discuss various recently proposed mechanisms for the induction of slow `drifts', oscillating variations and transient-in-time variations of the fundamental constants of Nature by dark matter, which offer a more natural means of producing a cosmological evolution of the fundamental constants compared with traditional dark energy-type theories, which invoke a (nearly) massless underlying field. Thus, measurements of variation of the fundamental constants gives us a new tool in dark matter searches.

    Comments:
    32 pages, 10 figures, Invited book review for the book `Indirect Effects of Dark Matter Physics', edited by Maxim Yu. Khlopov, World Scientific, 2016. ISBN: 978-981-4635-74-5
    Subjects:
    Atomic Physics (physics.atom-ph); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1509.00966 [pdf]
    10 citations
  6. 06

    [Submitted on 3 Sept 2015] (cross-list from hep-ph)

    Jet Quenching and Gluon to Hadron Fragmentation Function in Non-Equilibrium QCD at RHIC and LHC

    Gouranga C. Nayak🇺🇸

    Theoretical understanding of the observed jet quenching measurements at RHIC and LHC is challenging in QCD because it requires understanding of parton to hadron fragmentation function in non-equilibrium QCD. In this paper, by using closed-time path integral formalism, we derive the gauge invariant definition of the gluon to hadron fragmentation function in non-equilibrium QCD which is consistent with factorization theorem in non-equilibrium QCD from first principles.

    Comments:
    Final Version, Accepted For Publication in Phys. Part. Nucl. Lett., 19 Pages Latex
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1509.01148 [pdf]
    Phys.Part.Nucl.Lett.(2017)·29 citations
  7. 07

    [Submitted on 3 Sept 2015] (cross-list from hep-ph)

    Transport coefficients of the Gribov-Zwanziger plasma

    Wojciech Florkowski🇵🇱 · Radoslaw Ryblewski🇵🇱 · Nan Su🇩🇪 · Konrad Tywoniuk🇪🇸

    We study dynamic features of a plasma consisting of gluons whose infrared dynamics is improved by the Gribov-Zwanziger quantization. This approach embodies essential features of color confinement which set the plasma apart from conventional quasiparticle systems in several aspects. Our study focusses on a boost-invariant expansion for in- and out-of-equilibrium settings, which at late times can be characterized by the sound velocity, , and the shear, , and bulk, , viscosities. We obtain explicit expressions for the transport coefficients and and check that they are consistent with the numerical solutions of the kinetic equation. At high temperature, keeping both the Gribov parameter and the relaxation time constant, we find a scaling which manifests strong breaking of conformal symmetry in contrast to the case of weakly coupled plasmas.

    Comments:
    21 pages, 11 figures, minor changes: results obtained with momentum-dependent relaxation time are corrected, conclusions unmodified
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1509.01242 [pdf]
    PRC(2016)·57 citations

Affiliations

first authorsco-authorsvia INSPIRE