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Nuclear Theory·nucl-th

Thursday·June 29, 2017

8 papers—2 primary·6 cross-listed

All8Primary2Cross-lists6
  1. 01

    [Submitted on 28 Jun 2017]

    The application of the Quark-Hadron Chiral Parity-Doublet Model to neutron star matter

    A. Mukherjee🇩🇪 · S. Schramm🇩🇪 · J. Steinheimer🇩🇪 · V. Dexheimer🇺🇸

    The Quark-Hadron Chiral Parity-Doublet model (QP) is applied to calculate compact star properties in the presence of a deconfinement phase transition. Within this model, a consistent description of nuclear matter properties, chiral symmetry restoration, and a transition from hadronic to quark and gluonic degrees of freedom is possible within one unified approach. We find that the equation of state obtained is consistent with recent perturbative quantum chromodynamics (QCD) results and is able to accommodate observational constraints of massive and small neutron stars. Furthermore, we show that important features of the equation of state, such as the symmetry energy and its slope, are well within their observational constraints.

    Comments:
    8 pages, 9 figures and 1 table
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
    arXiv:
    1706.09191 [pdf]
    Astron.Astrophys.(2017)·48 citations
  2. 02

    [Submitted on 28 Jun 2017]

    Projection after variation in the finite-temperature Hartree-Fock-Bogoliubov approximation

    P. Fanto

    The finite-temperature Hartree-Fock-Bogoliubov (HFB) approximation often breaks symmetries of the underlying many-body Hamiltonian. Restricting the calculation of the HFB partition function to a subspace with good quantum numbers through projection after variation restores some of the correlations lost in breaking these symmetries, although effects of the broken symmetries such as sharp kinks at phase transitions remain. However, the most general projection after variation formula in the finite-temperature HFB approximation is limited by a sign ambiguity. Here, we extend the Pfaffian formula for the many-body traces of HFB density operators introduced by L. M. Robledo in Ref. [1] to eliminate this sign ambiguity and evaluate the more complicated many-body traces required in projection after variation in the most general HFB case. We validate our method through a proof-of-principle calculation of the particle-number-projected HFB thermal energy in a simple model.

    Comments:
    6 pages, 1 figure
    Subjects:
    Nuclear Theory (nucl-th); Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Superconductivity (cond-mat.supr-con)
    arXiv:
    1706.09373 [pdf]
    PRC(2017)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE