Exploring universal characteristics of neutron star matter with relativistic ab initio equations of state

Sibo Wang, Chencan Wang, and Hui Tong
Phys. Rev. C 106, 045804 – Published 12 October 2022

Abstract

Starting from the relativistic realistic nucleon-nucleon (NN) interactions, the relativistic Brueckner-Hartree-Fock (RBHF) theory in the full Dirac space is employed to study neutron star properties. First, the one-to-one correspondence relation for gravitational redshift and mass is established and used to infer the masses of isolated neutron stars by combining gravitational redshift measurements. Next, the ratio of the moment of inertia I to mass times radius squared MR2 as a function of the compactness M/R is obtained, and is consistent with the universal relations in the literature. The moment of inertia for 1.338M pulsar PSR J07373039A I1.338M is predicted to be 1.356×1045, 1.381×1045, and 1.407×1045gcm2 by the RBHF theory in the full Dirac space with NN interactions Bonn A, B, and C, respectively. Finally, the quadrupole moment of neutron star is calculated under the slow-rotation and small-tidal-deformation approximation. The equations of state constructed by the RBHF theory in the full Dirac space, together with those by the projection method and momentum-independence approximation, conform to universal I-Love-Q relations as well. By combing the tidal deformability from GW170817 and the universal relations from relativistic ab initio methods, the moment of inertia of a neutron star with 1.4 solar mass is also deduced as I1.4M=1.220.25+0.40×1045gcm2.

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  • Received 20 June 2022
  • Revised 29 August 2022
  • Accepted 20 September 2022

DOI:https://doi.org/10.1103/PhysRevC.106.045804

©2022 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Sibo Wang1, Chencan Wang2, and Hui Tong3,4,*

  • 1Department of Physics, Chongqing University, Chongqing 401331, China
  • 2School of Physics, Nankai University, Tianjin 300071, China
  • 3College of Physics and Materials Science, Tianjin Normal University, Tianjin 300387, China
  • 4Strangeness Nuclear Physics Laboratory, RIKEN Nishina Center, Wako 351-0198, Japan

  • *huitong@tjnu.edu.cn

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Vol. 106, Iss. 4 — October 2022

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