Speaker: Sugumi Kanno (Osaka University) Title: Detecting nonclassical primordial gravitational waves with Hanbury Brown - Twiss interferometry Abstract: We consider possible detection of nonclassicality of primordial gravitational waves (PGWs) by applying Hanbury Brown - Twiss (HBT) interferometry to cosmology. We characterize the nonclassicality of PGWs in terms of sub-Poissonian statistics that can be measured by