Magnetized neutron star crust within effective relativistic mean-field model

Vishal Parmar, H. C. Das, M. K. Sharma, and S. K. Patra
Phys. Rev. D 107, 043022 – Published 21 February 2023

Abstract

Even though the crystallized nature of the neutron star crust plays a pivotal role in describing various fascinating astrophysical observations, its microscopic structure is not fully understood in the presence of a colossal magnetic field. In the present work, we study the crustal properties of a neutron star within an effective relativistic mean field framework in the presence of magnetic field strength 1017G. We calculate the equilibrium composition of the outer crust by minimizing the Gibbs free energy using the most recent atomic mass evaluations. The magnetic field significantly affects the equation of state (EOS) and the properties of the outer crust, such as neutron drip density, pressure, and melting temperature. For the inner crust, we use the compressible liquid drop model for the first time to study the crustal properties in a magnetic environment. The inner crust properties, such as mass and charge number distribution, isospin asymmetry, cluster density, etc., show typical quantum oscillations (De Haas-van Alphen effect) sensitive to the magnetic field’s strength. The density-dependent symmetry energy influences the magnetic inner crust like the field-free case. We study the probable modifications in the pasta structures and it is observed that their mass and thickness changes by 1015% depending upon the magnetic field strength. The fundamental torsional oscillation mode frequency is investigated for the magnetized crust in the context of quasiperiodic oscillations in soft gamma repeaters. The magnetic field strengths considered in this work influences only the EOS of outer and shallow regions of the inner crust, which results in no significant change in global neutron star properties. However, the outer crust mass and its moment of inertia increase considerably with increase in magnetic field strength.

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  • Received 14 November 2022
  • Accepted 2 February 2023

DOI:https://doi.org/10.1103/PhysRevD.107.043022

© 2023 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Vishal Parmar1,*, H. C. Das2,3,†, M. K. Sharma1, and S. K. Patra2,3

  • 1School of Physics and Materials Science, Thapar Institute of Engineering and Technology, Patiala 147004, India
  • 2Institute of Physics, Sachivalaya Marg, Bhubaneswar 751005, India
  • 3Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400094, India

  • *physics.vishal01@gmail.com
  • harishdas.physics@gmail.com

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Issue

Vol. 107, Iss. 4 — 15 February 2023

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