Prospects for probing gravitational waves from primordial black hole binaries

Understand

We study the prospects of future gravitational wave (GW) detectors in probing primordial black hole (PBH) binaries.

• We show that across a broad mass range from $10^{-5}M_\odot$ to $10^7M_\odot$, future GW interferometers provide a potential probe of the PBH abundance that is more sensitive than any currently existing experiment.
• In particular, we find that galactic PBH binaries with masses as low as $10^{-5}M_\odot$ may be probed with ET, AEDGE and LISA by searching for nearly monochromatic continuous GW signals.
• Such searches could independently test the PBH interpretation of the ultrashort microlensing events observed by OGLE.