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Nuclear Theory·nucl-th

Thursday·August 1, 2019

7 papers—3 primary·4 cross-listed

All7Primary3Cross-lists4
  1. 01

    [Submitted on 31 Jul 2019]

    Effects of the equation of state on the bulk properties of maximally-rotating neutron stars

    P.S. Koliogiannis · Ch.C. Moustakidis

    Neutron stars are among the densest known objects in the universe and an ideal laboratory for the strange physics of super-condensed matter. While the simultaneously measurements of mass and radius of non-rotating neutron stars may impose constraints on the properties of the dense nuclear matter, the observation and study of maximally-rotating ones, close to the mass-shedding limit, may lead to significantly further constraints. Theoretical predictions allow neutron stars to rotate extremely fast (even more than ). However, until this moment, the fastest observed rotating pulsar has a frequency of , much lower compared to the theoretical predictions. There are many suggestions for the mechanism which lead to this situation. In any case, the theoretical study of uniformly rotating neutron stars, along with the accurate measurements, may offer rich information concerning the high density part of the equation of state. In addition, neutron stars through their evolution, may provide us with a criteria to determine the final fate of a rotating compact star. Sensitivity of bulk neutron stars properties on the equation of state at the mass-shedding limit are the main subject of the present study.

    Comments:
    v1: 16 pages, 24 figures. v2: 18 pages, 14 labeled figures, 5 tables, sections and references had been updated, accepted for publication in Phys. Rev. C
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc)
    arXiv:
    1907.13375 [pdf]
    PRC(2020)·63 citations
  2. 02

    [Submitted on 30 Jul 2019]

    Relativistic Feynman-Metropolis-Teller Equation of State for White Dwarfs in presence of Magnetic Field

    Sujan Kumar Roy · Somnath Mukhopadhyay · Joydev Lahiri · D.N. Basu

    The relativistic Feynman-Metropolis-Teller treatment of compressed atoms is extended to treat magnetized matter. Each atomic configuration is confined by a Wigner-Seitz cell and is characterized by a positive electron Fermi energy which varies insignificantly with the magnetic field. In the relativistic treatment the limiting configuration is reached when the Wigner-Seitz cell radius equals the radius of the nucleus with a maximum value of the electron Fermi energy which can not be attained in presence of magnetic field due to the effect of Landau quantization of electrons within the Wigner-Seitz cell. This treatment is implemented to develop the Equation of State for magnetized White Dwarf stars in presence of Coulomb screening. The mass-radius relations for magnetized White Dwarfs are obtained by solving the general relativistic hydrostatic equilibrium equations using Schwarzschild metric description suitable for non rotating and slowly rotating stars. The explicit effects of the magnetic energy density and pressure contributed by a density-dependent magnetic field are included to find the stable configurations of magnetized Super-Chandrasekhar White Dwarfs.

    Comments:
    11 pages including 12 figures and 1 table. arXiv admin note: text overlap with arXiv:1507.05439
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
    arXiv:
    1907.13480 [pdf]
    PRD(2019)·16 citations
  3. 03

    [Submitted on 31 Jul 2019]

    Heavy isotope production in collisions at MeV

    S. Ayik🇺🇸 · O. Yilmaz🇹🇷 · B. Yilmaz🇹🇷 · A. S. Umar🇺🇸

    Employing the quantal diffusion mechanism for multi-nucleon transfer, the double differential cross-sections are calculated for production of primary projectile-like and target-like fragments in collisions of system at MeV. Including de-excitation due to neutron emission, the cross-section for production of , and isotopes are estimated and compared with data.

    Comments:
    7 pages, 3 figures, 2 tables
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1907.13521 [pdf]
    PRC(2019)·29 citations

Affiliations

first authorsco-authorsvia INSPIRE