231 citations · 481 across the 4 of their papers we have counts for
4 papers
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…
The double formation of primordial black holes
Tomohiro Nakama
Primordial black holes (PBHs) are a useful tool in cosmology to probe primordial inhomogeneities on small scales that reenter the Hubble radius during the radiation dominated epoch…
Testing scenarios of primordial black holes being the seeds of supermassive black holes by ultracompact minihalos and CMB -distortions
Kazunori Kohri, Tomohiro Nakama, Teruaki Suyama
Supermassive black holes and intermediate mass black holes are believed to exist in the Universe. There is no established astrophysical explanation for their origin and considerati…