Can the GW190814 secondary component be a bosonic dark matter admixed compact star?

Abstract

We investigate whether the recently observed 2.6 $M_{\odot }$ compact object in the gravitational-wave event GW190814 can be a bosonic dark matter admixed compact star. By considering the three constraints in mass, radius and stability of such an object, we find that if the dark matter 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 $M_{\odot }$ object can still be a neutron star admixed with at least 2.0 $M_{\odot }$ of dark matter made of axion-like particles (or even a pure axion-like particle star) if $2\times 10^{-11}$ eV $\le m\le 2.4\times 10^{-11}$ eV ($2.9\times 10^{-11}$ eV $\le m\le 3.2\times 10^{-11}$ eV) and with decay constant $f\ge 8\times 10^{17}$ GeV.

arXiv comment14 pages, 8 figures, accepted for publication in ApJ

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