Uniformly rotating, axisymmetric, and triaxial quark stars in general relativity

Enping Zhou, Antonios Tsokaros, Luciano Rezzolla, Renxin Xu, and Kōji Uryū
Phys. Rev. D 97, 023013 – Published 19 January 2018

Abstract

Quasiequilibrium models of uniformly rotating axisymmetric and triaxial quark stars are computed in a general-relativistic gravity scenario. The Isenberg-Wilson-Mathews (IWM) formulation is employed and the Compact Object Calculator (cocal) code is extended to treat rotating stars with finite surface density and new equations of state (EOSs). Besides the MIT bag model for quark matter which is composed of deconfined quarks, we examine a new EOS proposed by Lai and Xu that is based on quark clustering and results in a stiff EOS that can support masses up to 3.3M in the case we considered. We perform convergence tests for our new code to evaluate the effect of finite surface density in the accuracy of our solutions and construct sequences of solutions for both small and high compactness. The onset of secular instability due to viscous dissipation is identified and possible implications are discussed. An estimate of the gravitational wave amplitude and luminosity based on quadrupole formulas is presented and comparison with neutron stars is discussed.

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  • Received 31 October 2017

DOI:https://doi.org/10.1103/PhysRevD.97.023013

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Enping Zhou1,2, Antonios Tsokaros2,3, Luciano Rezzolla2,4, Renxin Xu1,5, and Kōji Uryū6

  • 1State Key Laboratory of Nuclear Science and Technology and School of Physics, Peking University, Beijing 100871, People’s Republic of China
  • 2Institute for Theoretical Physics, Frankfurt am Main 60438, Germany
  • 3Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
  • 4Frankfurt Institute of Advanced Studies, Frankfurt am Main 60438, Germany
  • 5Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing, 100871, People’s Republic of China
  • 6Department of Physics, University of the Ryukyus, Senbaru, Nishihara, Okinawa 903-0213, Japan

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Issue

Vol. 97, Iss. 2 — 15 January 2018

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