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. 

Bio: Fa Peng Huang is an associate professor at Sun Yat-Sen University. He got the Ph.D.from Peking University in 2015, and then joined IHEP, IBS, and Washington University in St. Louis as postdoctoral researchers from 2015 to 2021. He joined the TianQin Center, School of Physics and Astronomy at Sun Yat-Sen University from 2021. His research focuses on the interplay between particle cosmology and particle astrophysics. He has published about 30 papers in Phys. Rev. D. ,Phys. Rev. Lett. and other journals. Focusing on Higgs (axion), the scalar particle that is very important in fundamental physics and early universe, he has studied how to use gravitational waves, radio and collider signals to complementarily explore the properties of Higgs(axion) and its cosmological roles (the matter-antimatter asymmetry of the universe, dark matter, etc.).

seminar220922_huang.pdf