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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. Then we estimate the merger rate of PBH binaries and find that the gravitational-wave event GW150914 is very unlikely produced by the merger of a PBH binary. In addition, we work out the Stochastic Gravitational-Wave Background (SGWB) generated by the merger of PBH binaries.
Prof. Qingguo Huang got his Bachelor degree in the University of Science and Technology of China in 2000 and received Ph.D degree in the Institute of theoretical physics - CAS in 2004, and then spent six years in the interdisciplinary center of theoretical studies - CAS and Korea institute for advanced study. In 2010 he jointed the institute of theoretical physics - CAS as a faculty in the one-hundred talent program of CAS. He got Outstanding Youth Foundation supported by NSFC in 2013 and become a member in the Top-Notch Young Talents Program of China in 2015. He mainly works on the topics about inflation and dark energy. Recently he pays much attention on the physics related to gravitational waves.