231 citations · 1.9k across the 26 of their papers we have counts for
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Stochastic gravitational waves associated with the formation of primordial black holes
Tomohiro Nakama, Joseph Silk, Marc Kamionkowski
Primordial black hole (PBH) mergers have been proposed as an explanation for the gravitational wave events detected by the LIGO collaboration. Such PBHs may be formed in the early…
Supermassive black holes formed by direct collapse of inflationary perturbations
Tomohiro Nakama, Teruaki Suyama, Jun'ichi Yokoyama
We propose a mechanism of producing a new type of primordial perturbations that collapse to primordial black holes whose mass can be as large as necessary for them to grow to the s…
Primordial black holes as a novel probe of primordial gravitational waves. II: Detailed analysis
Tomohiro Nakama, Teruaki Suyama
Recently we have proposed a novel method to probe primordial gravitational waves from upper bounds on the abundance of primordial black holes (PBHs). When the amplitude of primordi…