Explore dark matter by gravitational wave and radio signals


 The LIGO-Virgo Collaboration has so far detected more than 100 black holes, whose mass distribution appears to have a peak at ∼ 30M☉ and two tails on the ends. By assuming that they all have a primordial origin, we analyzed the LIGO datasets by performing maximum likelihood estimation on a broken power law mass function, which appears to behave better than the popular log-normal mass function. Surprisingly, such a simple distribution can be realized in our previously proposed mechanism of primordial black holes, where the black holes are formed by vacuum bubbles that nucleate during inflation via quantum tunneling. These black holes could also serve as seeds of supermassive black holes.