Formation of intermediate-mass black holes as primordial black holes in the inflationary cosmology with running spectral index

Toshihiro Kawaguchi, Masahiro Kawasaki, Tsutomu Takayama +2

Formation of primordial black holes (PBHs) on astrophysical mass scales is a natural consequence of inflationary cosmology if the primordial perturbation spectrum has a large and n…