Primordial black hole formation from an axion-like curvaton model
  We argue that the existence of the cold dark matter is explained by
primordial black holes.We show that a significant number of primordial black
holes can be formed in an axion-like curvaton model, in which the highly
blue-tilted power spectrum of primordial curvature perturbations is achieved.It
is found that the produced black holes with masses $\sim 10^{20} -10^{38}
\mathrm{g}$ account for the present cold dark matter.We also argue the
possibility of forming the primordial black holes with mass $\sim 10^5
M_{\odot}$ as seeds of the supermassive black holes.
