Could the GW190814 Secondary Component Be a Bosonic Dark Matter Admixed Compact Star?

Abstract We investigate whether the recently observed 2.6 M ⊙ compact object in the gravitational wave event GW190814 can be a bosonic dark matter (DM) admixed compact star. By considering the three constraints of mass, radius, and the stability of such an object, we find that if the DM is made of Q...

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Bibliographic Details
Published in:	The Astrophysical journal 2021-12, Vol.922 (2), p.242
Main Authors:	Lee, Billy K. K., Chu, Ming-chung, Lin, Lap-Ming
Format:	Article
Language:	eng
Subjects:	Black holes Constraints Dark matter Decay rate Gravitational waves Neutron stars Neutrons Particle mass
Online Access:	Get full text
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Summary:	Abstract We investigate whether the recently observed 2.6 M ⊙ compact object in the gravitational wave event GW190814 can be a bosonic dark matter (DM) admixed compact star. By considering the three constraints of mass, radius, and the stability of such an object, we find that if the DM is made of QCD axions, their particle mass m is constrained to a range that has already been ruled out by the independent constraint imposed by the stellar-mass black hole superradiance process. The 2.6 M ⊙ object can still be a neutron star admixed with at least 2.0 M ⊙ of DM made of axion-like particles (or even a pure axion-like particle star) if 2 × 10 −11 eV ≤ m ≤ 2.4 × 10 −11 eV (2.9 × 10 −11 eV ≤ m ≤ 3.2 × 10 −11 eV) with a decay constant of f ≥ 8 × 10 17 GeV.
ISSN:	0004-637X 1538-4357