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

Understand

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 $\leq m \leq 2.4 \times 10^{-11}$ eV ($2.9 \times 10^{-11}$ eV $\leq m \leq 3.2 \times 10^{-11}$ eV) and with decay constant $f \geq 8 \times 10^{17}$ GeV.