Seminar:- Did LIGO Hear the Coalescence of Primordial Black Holes? 
We use Planck data released in 2015 to constrain the abundance of primordial black holes (PBHs) in dark matter in two different reionization models (one is the instantaneous reionization and the other is the asymmetric reionization), and significantly improve the existing upper limits on the abundance of PBHs by around two orders of magnitude. Furthermore, we estimated the event rates of mergers of PBH binaries and concluded that the gravitational-wave event GW150914 is very unlikely produced by the merger of a PBH binary. 
時間:2016.10.12(三) 15:30 ~ 16:15 
地點:香港中文大學 科學館北座 G26 
講者:黃慶國 博士 Dr. Qing-Guo HUANG (Institute of Theoretical Physics Chinese Academy of Sciences, China)