[[UTAPwiki/セミナー/初期宇宙・相対論速報]] Speaker: Keisuke Inomata (ICRR) Title: Double Inflation as a single origin of PBHs for all dark matter and LIGO Abstract: Primordial Black Hole (PBH) is one of the leading non-particle candidates for dark matter (DM). Although several observations severely constrain the amount of PBHs, it is recently pointed out that there is an uncertainty on the microlensing constraints below ~ 10^{-10} M_\odot which was ignored originally but may weaken the constraints significantly. In this paper, facing this uncertainty, we investigate the possibility that PBHs can make up all DM in a broad mass spectrum. Moreover, we propose a concrete inflation model which can simultaneously produce PBHs for all DM in a broad mass spectrum around O(10^{-13}) M_\odot and PBHs for LIGO events in a sharp mass spectrum at O(10) M_\odot. This talk is based on our recent paper (arXiv:1711.06129). &br; |