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Nuclear Theory·nucl-th

Thursday·February 6, 2020

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 01

    [Submitted on 5 Feb 2020]

    -dependent multiplicity fluctuations from PCA and initial conditions

    Fernando G. Gardim🇧🇷 · Frédérique Grassi🇧🇷 · Pedro Ishida🇧🇷 · Matthew Luzum🇧🇷 · Jean-Yves Ollitrault🇫🇷

    We present a Principal Component Analysis for a hydrodynamic simulation and compare with CMS experimental data. While the results are reasonable for anisotropic flow, for multiplicity fluctuations they are qualitatively different. We argue that this is due to too large transverse momentum () fluctuations and covariance in the simulation than seen experimentally. In turn this is related to too large initial size fluctuations.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2002.01747 [pdf]
    NPA(2021)·3 citations
  2. 02

    [Submitted on 5 Feb 2020]

    How accurately can the Extended Thomas-Fermi method describe the inner crust of a neutron star?

    Matthew Shelley · Alessandro Pastore

    We perform a systematic comparison between the results obtained by solving fully self-consistently the Hartree-Fock-Bogoliubov equations, and those obtained using the semi-classical Extended Thomas-Fermi method, for various Wigner-Seitz cells within the inner crust of a neutron star. The lack of pairing correlations in the semi-classical approach leads to a large discrepancy between the two approaches. This discrepancy is well beyond the error of the quantum-mechanical calculation, and is related to spurious shell effects in the neutron gas.

    Comments:
    10 pages, 5 figures, accepted for publication in Journal of Physics: Conference Series
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2002.01839 [pdf]
    J.Phys.Conf.Ser.(2020)·6 citations
  3. 03

    [Submitted on 5 Feb 2020]

    Model nuclear energy density functionals derived from ab initio calculations

    G. Salvioni · J. Dobaczewski · C. Barbieri · G. Carlsson · A. Idini · A. Pastore

    We present the first application of a new approach, proposed in [Journal of Physics G: Nuclear and Particle Physics, 43, 04LT01 (2016)] to derive coupling constants of the Skyrme energy density functional (EDF) from ab initio Hamiltonian. By perturbing the ab initio Hamiltonian with several functional generators defining the Skyrme EDF, we create a set of metadata that is then used to constrain the coupling constants of the functional. We use statistical analysis to obtain such an ab initio-equivalent Skyrme EDF. We find that the resulting functional describes properties of atomic nuclei and infinite nuclear matter quite poorly. This may point out to the necessity of building up the ab initio-equivalent functionals from more sophisticated generators. However, we also indicate that the current precision of the ab initio calculations may be insufficient for deriving meaningful nuclear EDFs.

    Comments:
    24 pages, 7 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2002.01903 [pdf]
    J.Phys.G(2020)·19 citations
  4. 04

    [Submitted on 5 Feb 2020]

    From Chiral Kinetic Theory To Spin Hydrodynamics

    Shuzhe Shi🇨🇦 · Charles Gale🇨🇦 · Sangyong Jeon🇨🇦

    The total angular momentum is conserved in the evolution of the Quark-Gluon Plasma (QGP) created in heavy-ion collision, and consists of two sectors: the orbital angular momentum (OAM) caused by kinetic motion, and the spin, an intrinsic degree of freedom of quarks and gluons. Microscopic scattering processes allow the conversion between these two components, hence the spin density could eventually have non-trivial influence on the QGP evolution. A hydrodynamic theory, with the spin polarization effect properly taken into account, is required to quantitatively study the polarization rate for observed hadrons, e.g. the -hyperon. In this work, we start with chiral kinetic theory and construct the spin hydrodynamic framework for a chiral spinor system. We obtain the equations of motion of second-order dissipative relativistic fluid dynamics with non-trivial spin polarization density.

    Comments:
    4 pages, contribution to the proceeding of XXVIIIth International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 2019)
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2002.01911 [pdf]
    NPA(2021)·22 citations

Affiliations

first authorsco-authorsvia INSPIRE