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Maximum mass and universal relations of rotating relativistic hybrid hadron-quark stars

  • Gabriele BozzolaEmail author
  • Pedro L. Espino
  • Collin D. Lewin
  • Vasileios Paschalidis
Regular Article - Theoretical Physics
  • 4 Downloads
Part of the following topical collections:
  1. First joint gravitational wave and electromagnetic observations: Implications for nuclear and particle physics

Abstract.

We construct equilibrium models of uniformly and differentially rotating hybrid hadron-quark stars using equations of state (EOSs) with a first-order phase transition that gives rise to a third family of compact objects. We find that the ratio of the maximum possible mass of uniformly rotating configurations --the supramassive limit-- to the Tolman-Oppenheimer-Volkoff (TOV) limit mass is not EOS-independent, and is between 1.15 and 1.31, in contrast with the value of 1.20 previously found for hadronic EOSs. Therefore, some of the constraints placed on the EOS from the observation of the gravitational wave event GW170817 do not apply to hadron-quark EOSs. However, the supramassive limit mass for the family of EOSs we treat is consistent with limits set by GW170817, strengthening the possibility of interpreting GW170817 with a hybrid hadron-quark EOS. We also find that along constant angular momentum sequences of uniformly rotating stars, the third family maximum and minimum mass models satisfy approximate EOS-independent relations, and the supramassive limit of the third family is approximately 16.5% larger than the third family TOV limit. For differentially rotating spheroidal stars, we find that a lower-limit on the maximum supportable rest mass is 123% more than the TOV limit rest mass. Finally, we verify that the recently discovered universal relations relating angular momentum, rest mass and gravitational mass for turning-point models hold for hybrid hadron-quark EOSs when uniform rotation is considered, but have a clear dependence on the degree of differential rotation.

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Copyright information

© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Gabriele Bozzola
    • 1
    Email author
  • Pedro L. Espino
    • 2
  • Collin D. Lewin
    • 1
  • Vasileios Paschalidis
    • 1
    • 2
  1. 1.Department of AstronomyUniversity of ArizonaTucsonUSA
  2. 2.Department of PhysicsUniversity of ArizonaTucsonUSA

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