Effect of the σ-cut potential on the properties of neutron stars with or without a hyperonic core

N. K. Patra, B. K. Sharma, A. Reghunath, A. K. H. Das, and T. K. Jha
Phys. Rev. C 106, 055806 – Published 17 November 2022

Abstract

Motivated by the recent observation of high-mass pulsars (M2M), we employ the σ-cut potential on the equation of state (EOS) of high-density matter and the properties of neutron stars within the relativistic mean-field model using TM1* parameter set. The σ-cut potential is known to reduce the contributions of the σ field, resulting in a stiffer EOS at high densities and hence leading to larger neutron star masses without affecting the properties of nuclear matter at normal saturation density. We also analyzed the effect of the same on pure neutron matter and also on the neutron star matter with and without hyperonic core and compared it with the available theoretical, experimental, and observational data. The corresponding tidal deformability (Λ1.4) is also calculated. With the choice of meson-hyperon coupling fixed to hypernuclear potentials, we obtain 10% increase in mass by employing the σcut potential for fs=0.6. Our results are in good agreement with various experimental constraints and observational data, particularly with the GW170817 data.

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  • Received 22 August 2022
  • Accepted 21 October 2022

DOI:https://doi.org/10.1103/PhysRevC.106.055806

©2022 American Physical Society

Physics Subject Headings (PhySH)

Nuclear PhysicsGravitation, Cosmology & Astrophysics

Authors & Affiliations

N. K. Patra1, B. K. Sharma2,*, A. Reghunath2,3, A. K. H. Das2, and T. K. Jha1

  • 1Department of Physics, BITS-Pilani, K. K. Birla Goa Campus, Goa 403726, India
  • 2Department of Sciences, Amrita School of Physical Sciences, Amrita Vishwa Vidyapeetham, Coimbatore 641112, India
  • 3Institut fuer Physik, Experimentelle Elementarteilchenphysik II (EE2), Humboldt-Universitaet zu Berlin, 12489 Berlin, Germany

  • *bk_sharma@cb.amrita.edu

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Issue

Vol. 106, Iss. 5 — November 2022

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