Constraining exotic compact stars composed of bosonic and fermionic dark matter with gravitational wave events

Understand

We investigate neutron star-black hole (NS-BH) merger candidates as a test for compact exotic objects.

• Using the events GW190814, GW200105 and GW200115 measured by the LIGO-Virgo collabration, which represent a broad profile of the masses in the NS mass spectrum, we demonstrate the constraining power for the parameter spaces of compact stars consisting of dark matter for future measurements.
• We consider three possible cases of dark matter stars: self-interacting, purely bosonic or fermionic dark matter stars, stars consisting of a mixture of interacting bosonic and fermionic matter, as well as the limiting case of selfbound stars.
• We find that the scale of those hypothetical objects are dominated by the one of the strong interaction.