Constraint on hybrid stars with gravitational wave events

Abstract

Motivated by the recent discoveries of compact objects from LIGO/Virgo observations, we study the possibility of identifying some of these objects as compact stars made of dark matter called dark stars, or the mix of dark and nuclear matters called hybrid stars. In particular, in GW190814, a new compact object with 2.6 $M_{\odot }$ is reported. This could be the lightest black hole, the heaviest neutron star, and a dark or hybrid star. In this work, we extend the discussion on the interpretations of the recent LIGO/Virgo events as hybrid stars made of various self-interacting dark matter (SIDM) in the isotropic limit. We pay particular attention to the saddle instability of the hybrid stars which will constrain the possible SIDM models.

19 pages, 7 figures, for Universe special issue "Neutron Star Astrophysics"; v2: minor revisions, references added, published version

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• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Tidal Love numbers of neutron stars
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Cited by in corpus (2)

• Dynamical evolution of dark matter admixed neutron stars
• $2.6M_{\odot }$ Compact Object and Neutron Stars within Eddington-Inspired Born-Infeld Theory of Gravity