PaperPanorama
FAQ

Nuclear Theory·nucl-th

Friday·May 5, 2017

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 01

    [Submitted on 3 May 2017]

    Equilibration and hydrodynamics at strong and weak coupling

    Wilke van der Schee🇺🇸

    We give an updated overview of both weak and strong coupling methods to describe the approach to a plasma described by viscous hydrodynamics, a process now called hydrodynamisation. At weak coupling the very first moments after a heavy ion collision is described by the colour-glass condensate framework, but quickly thereafter the mean free path is long enough for kinetic theory to become applicable. Recent simulations indicate thermalization in a time [1], with the temperature at that time and the shear viscosity divided by the entropy density. At (infinitely) strong coupling it is possible to mimic heavy ion collisions by using holography, which leads to a dual description of colliding gravitational shock waves. The plasma formed hydrodynamises within a time of . A recent extension found corrections to this result for finite values of the coupling, when is bigger than the canonical value of , which leads to [2]. Future improvements include the inclusion of the effects of the running coupling constant in QCD.

    Comments:
    7 pages, 4 figures, talk presented at Quark Matter 2017 (Chicago)
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Theory (hep-th)
    arXiv:
    1705.01556 [pdf]
    NPA(2017)·5 citations
  2. 02

    [Submitted on 4 May 2017]

    Fully self-consistent relativistic Brueckner-Hartree-Fock theory for finite nuclei

    Shihang Shen · Haozhao Liang · Jie Meng · Peter Ring · Shuangquan Zhang

    Starting from the relativistic form of the Bonn potential as a bare nucleon-nucleon interaction, the full Relativistic Brueckner-Hartree-Fock (RBHF) equations are solved for finite nuclei in a fully self-consistent basis. This provides a relativistic ab initio calculation of the ground state properties of finite nuclei without any free parameters and without three-body forces. The convergence properties for the solutions of these coupled equations are discussed in detail at the example of the nucleus O. The binding energies, radii, and spin-orbit splittings of the doubly magic nuclei He, O, and Ca are calculated and compared with the earlier RBHF calculated results in a fixed Dirac Woods-Saxon basis and other non-relativistic ab initio calculated results based on pure two-body forces.

    Comments:
    22 pages, 13 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1705.01691 [pdf]
    PRC(2017)·59 citations
  3. 03

    [Submitted on 4 May 2017]

    "Sloppy" nuclear energy density functionals (II): Finite nuclei

    Tamara Nikšić · Marko Imbrišak · Dario Vretenar

    A study of parameter sensitivity of nuclear energy density functionals, initiated in the first part of this work \cite{NV.16}, is extended by the inclusion of data on ground-state properties of finite nuclei in the application of the manifold boundary approximation method (MBAM). Density functionals used in self-consistent mean-field calculations, and nuclear structure models based on them, are generally "sloppy" and exhibit an exponential range of sensitivity to parameter variations. Concepts of information geometry are used to identify the presence of effective functionals of lower dimension in parameter space associated with parameter combinations that can be tightly constrained by data. The MBAM is used in an iterative procedure that systematically reduces the complexity and the dimension of parameter space of a sloppy functional, with properties of nuclear matter and data on finite nuclei determining not only the values of model parameters, but also the optimal functional form of the density dependence.

    Comments:
    Accepted for publication in Physical Review C. arXiv admin note: text overlap with arXiv:1606.08617
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1705.01760 [pdf]
    PRC(2017)·12 citations
  4. 04

    [Submitted on 4 May 2017]

    The right choice of moment for anisotropic fluid dynamics

    H. Niemi · E. Molnár · D. H. Rischke

    We study anisotropic fluid dynamics derived from the Boltzmann equation based on a particular choice for the anisotropic distribution function within a boost-invariant expansion of the fluid in one spatial dimension. In order to close the conservation equations we need to choose an additional moment of the Boltzmann equation. We discuss the influence of this choice of closure on the time evolution of fluid-dynamical variables and search for the best agreement to the solution of the Boltzmann equation in the relaxation-time approximation.

    Comments:
    4 pages, 4 figures, proceedings for Quark Matter 2017
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1705.01851 [pdf]
    NPA(2017)·7 citations

Affiliations

first authorsco-authorsvia INSPIRE