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Nuclear Theory·nucl-th

Friday·March 9, 2018

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 05

    [Submitted on 6 Mar 2018] (cross-list from hep-ph)

    Potential Energy Between Static Quarks Is Time Dependent in The Classical Yang-Mills Theory

    Gouranga C Nayak🇺🇸

    Lattice QCD predicts that the potential energy between static quarks is independent of time. However, in this paper we show that the gauge invariant color singlet potential energy between static quarks in the classical Yang-Mills theory depends on time even if the quarks are at rest. This is a consequence of the time dependent fundamental color charge of the quark in the classical Yang-Mills theory. We find that the gauge invariant color singlet time dependent potential energy between static quarks does not violate the conservation of energy in the Yang-Mills theory.

    Comments:
    4 New Sections Added, 23 Pages Latex
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1803.02268 [pdf]
    3 citations
  2. 06

    [Submitted on 7 Mar 2018] (cross-list from hep-ph)

    Applied Holography of the AdS-Kerr Spacetime

    Brett McInnes🇸🇬

    Asymptotically Anti-de Sitter Kerr black holes (we focus here on the five-dimensional case) are associated holographically with matter at conformal infinity which has a non-zero angular momentum density. It is natural to attempt to associate this angular momentum with the recently discovered vorticity of the plasmas produced in peripheral heavy-ion collisions. We assume that an AdS-Kerr black hole with angular momentum to mass ratio is dual to boundary matter with an angular momentum density to energy density ratio also equal to . With this assumption, we find that, for collisions corresponding to a given value of , there is a maximal possible angular velocity (well below the maximal value permitted by causality) for such matter at infinity, and that this value is in approximate agreement with the experimentally reported value of the average plasma vorticity produced in typical peripheral collisions of heavy ions.

    Comments:
    23 pages, 1 figure
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1803.02528 [pdf]
    Int.J.Mod.Phys.A(2019)·21 citations
  3. 07

    [Submitted on 7 Mar 2018] (cross-list from hep-lat)

    Extraction of isoscalar phase-shifts from lattice QCD

    Dehua Guo🇺🇸 · Andrei Alexandru🇺🇸 · Raquel Molina🇧🇷 · Maxim Mai🇺🇸 · Michael Döring🇺🇸

    We conduct a two-flavor () lattice QCD calculation of the elastic phase-shifts for pion-pion scattering in the scalar, isoscalar channel (the -meson). The calculation is performed for two quark masses corresponding to a pion mass of and . The -meson parameters are extracted using various parametrizations of the scattering amplitude. The results obtained from a chiral unitary parametrization are extrapolated to the physical point and read , where the uncertainties in the parentheses denote the stochastic and systematic ones. The behavior of the -meson parameters with increasing pion mass is discussed as well.

    Comments:
    14 pages, 8 figures
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1803.02897 [pdf]
    PRD(2018)·91 citations
  4. 08

    [Submitted on 8 Mar 2018] (cross-list from physics.comp-ph)

    Deep Learning: A Tool for Computational Nuclear Physics

    Gianina Alina Negoita · Glenn R. Luecke · James P. Vary · Pieter Maris · Andrey M. Shirokov · Ik Jae Shin · Youngman Kim · Esmond G. Ng · Chao Yang

    In recent years, several successful applications of the Artificial Neural Networks (ANNs) have emerged in nuclear physics and high-energy physics, as well as in biology, chemistry, meteorology, and other fields of science. A major goal of nuclear theory is to predict nuclear structure and nuclear reactions from the underlying theory of the strong interactions, Quantum Chromodynamics (QCD). With access to powerful High Performance Computing (HPC) systems, several ab initio approaches, such as the No-Core Shell Model (NCSM), have been developed to calculate the properties of atomic nuclei. However, to accurately solve for the properties of atomic nuclei, one faces immense theoretical and computational challenges. The present study proposes a feed-forward ANN method for predicting the properties of atomic nuclei like ground state energy and ground state point proton root-mean-square (rms) radius based on NCSM results in computationally accessible basis spaces. The designed ANNs are sufficient to produce results for these two very different observables in 6Li from the ab initio NCSM results in small basis spaces that satisfy the theoretical physics condition: independence of basis space parameters in the limit of extremely large matrices. We also provide comparisons of the results from ANNs with established methods of estimating the results in the infinite matrix limit.

    Comments:
    9 pages, 9 figures, published in the Proceedings of the Ninth International Conference on Computational Logics, Algebras, Programming, Tools, and Benchmarking COMPUTATION TOOLS 2018 February 18-22, 2018, Barcelona, Spain by IARIA
    Subjects:
    Computational Physics (physics.comp-ph); Nuclear Theory (nucl-th)
    arXiv:
    1803.03215 [pdf]
    Proceedings of the Ninth International Co…·15 citations

Affiliations

first authorsco-authorsvia INSPIRE