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Finding quark content of neutron stars in light of GW170817

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Abstract

The detection of gravitational waves from GW170817 has provided a new opportunity to constrain the equation of state (EOS) of neutron stars. In this article, we investigate the possible existence of quarks inside the neutron star core in the context of GW170817. The nucleon phase is treated within the relativistic nuclear mean-field approach where we have employed a fully comprehensive set of available models, and the quark phase is described in the Bag model. We show that the nucleonic EOSs which are inconsistent with the tidal deformability bound become consistent when phase transition to quark matter via Gibbs construction is allowed. We find that several nucleonic EOSs support the presence of pure quark matter core with a small mass not more than \(0.17M_\odot \) confined within a radius of 0.9 km. We also find that the strong correlation between tidal deformability and neutron star radii observed for pure nucleonic stars does persist even with a nucleon-quark phase transition and provides an upper limit on the radius of \(R_{1.4} \lesssim 12.9\) km for a \(1.4M_\odot \) neutron star.

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Authors and Affiliations

  1. Polba Mahavidyalaya, Hooghly, West Bengal, 712148, India

    Rana Nandi

  2. Department of Nuclear and Atomic Physics, Tata Institute of Fundamental Research, Mumbai, 400005, India

    Subrata Pal

Authors
  1. Rana Nandi
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  2. Subrata Pal
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Correspondence to Rana Nandi.

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Nandi, R., Pal, S. Finding quark content of neutron stars in light of GW170817. Eur. Phys. J. Spec. Top. 230, 551–559 (2021). https://doi.org/10.1140/epjs/s11734-021-00004-4

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