Finding quark content of neutron stars in light of GW170817

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.

13 pages, 4 figures, to appear in EPJST

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• Compact star merger events with stars composed of interacting strange quark matter
• A Detailed Analysis of the Special Points on $M-R$ Solutions of Hybrid (Twin) Stars
• Properties of Hybrid Stars with Density Dependent Bag Model
• Universal Relations for Binary Neutron Star Mergers with Long-lived Remnants
• Baryonic dense matter in view of gravitational-wave observations
• Effects of Onset of Phase Transition on Binary Neutron Star Mergers
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• Analyzing the dense matter equation of states in the light of the compact object HESS J1731-347
• Multimessenger signal from phase transition of neutron star to quark star
• Semi Universal relation to understand matter properties at neutron star interiors
• Gravitational wave signatures of phase transition from hadronic to quark matter in isolated neutron stars and binaries
• Inferring neutron star properties through gravitational waves from r-modes and their relativistic counterparts