Detecting gravitational waves from sub-solar mass primordial black holes

The detections of black holes by LIGO have been show to be consisent with the primordial black hole (PBH) hypothesis, that is: it is possible that the black holes we observe actually formed in the early universe, not due eto some astrophysical processes. Primoridal black holes could constitute a fraction of or all of dark matter, and take on virtually any mass within 30 orders of magnitude. Specifically, in our work we developed this method to search for gravitational waves from planetary-mass and asteroid-mass primordial black holes, which would last hours to years in-band. While we have been able to constrain planetary-mass PBHs and almost constrain asteroid-mass PBHs, we have not yet handled the case in which other forms of dark matter could exist around the PBHs, thus altering the kind of signal we expect. This will likely be relevant in future gravitational-wave detectors that can probe the inspiral of such systems at much lower orbital frequencies than currently possible. Additionally, we have not accounted for eccentricity or spins in the waveforms themselves, or any higher-order corrections to the phase evolution of the signal.