Primordial black hole formation from an axion-like curvaton model

Abstract

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.

18 pages, 9 figures

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