Rotating neutron stars with quark cores

Ishfaq A. Rather, Usuf Rahaman, M. Imran, H. C. Das, A. A. Usmani, and S. K. Patra
Phys. Rev. C 103, 055814 – Published 24 May 2021

Abstract

The rotating neutron-star properties are studied to investigate a phase transition to quark matter. The density-dependent relativistic mean-field model (DD-RMF) is employed to study the hadron matter, while the vector-enhanced bag (vBag) model is used to study the quark matter. The star-matter properties such as mass, radius, the moment of inertia, rotational frequency, Kerr parameter, and other important quantities are studied to see their effect on quark matter. The maximum mass of a rotating neutron star with the DD-LZ1 and DD-MEX parameter sets is found to be around 3M for pure hadronic phase and decreases to around 2.6M upon phase transitioning to quark matter, which satisfies the recent GW190814 possible maximum mass constraint, implying that the secondary component of GW190814 could be a fast-rotating hybrid star. For DDV, DDVT, and DDVTD parameter sets, the maximum mass decreases to satisfy 2M. The moment of inertia calculated for various DD-RMF parameter sets decreases with the increasing mass satisfying constraints from various measurements. Other important quantities calculated also vary with the bag constant and hence show that the presence of quarks inside neutron stars can also allow us to constraint these quantities to determine a proper equation of state. Also, the theoretical study along with the accurate measurement of uniformly rotating neutron-star properties may offer some valuable information concerning the high-density part of the equation of state.

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  • Received 10 February 2021
  • Accepted 13 May 2021

DOI:https://doi.org/10.1103/PhysRevC.103.055814

©2021 American Physical Society

Physics Subject Headings (PhySH)

Nuclear PhysicsGravitation, Cosmology & Astrophysics

Authors & Affiliations

Ishfaq A. Rather1,*, Usuf Rahaman1, M. Imran1, H. C. Das2,3, A. A. Usmani1, and S. K. Patra2,3

  • 1Department of Physics, Aligarh Muslim University, Aligarh 202002, India
  • 2Institute of Physics, Bhubaneswar 751005, India
  • 3Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400094, India

  • *ishfaqrather81@gmail.com

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Issue

Vol. 103, Iss. 5 — May 2021

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