Hunt for Light Primordial Black Hole Dark Matter with Ultra-High-Frequency Gravitational Waves

Understand

Light primordial black holes may comprise a dominant fraction of the dark matter in our Universe.

• This paper critically assesses whether planned and future gravitational wave detectors in the ultra-high-frequency band could constrain the fraction of dark matter composed of sub-solar primordial black holes.
• Adopting the state-of-the-art description of primordial black hole merger rates, we compare various signals with currently operating and planned detectors.
• As already noted in the literature, our findings confirm that detecting individual primordial black hole mergers with currently existing and operating proposals remains difficult.