231 citations · 1.9k across the 26 of their papers we have counts for
4 papers · 1 filter
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…
Reheating the Universe Once More: The Dissipation of Acoustic Waves as a Novel Probe of Primordial Inhomogeneities on Even Smaller Scales
Tomohiro Nakama, Teruaki Suyama, Jun'ichi Yokoyama
We provide a simple but robust bound on the primordial curvature perturbation in the range , which has not been constrained so far un…
Investigating formation condition of primordial black holes for generalized initial perturbation profiles
Tomohiro Nakama, Tomohiro Harada, A. G. Polnarev +1
Primordial black holes (PBHs) are an important tool in cosmology to probe the primordial spectrum of small-scale curvature perturbations that reenter the cosmological horizon durin…