Primordial black hole formation from an axion-like curvaton model

TL;DR

This paper proposes that primordial black holes formed from an axion-like curvaton model could explain cold dark matter and seed supermassive black holes, with specific mass ranges derived from the model.

Contribution

It introduces a novel axion-like curvaton model that generates a highly blue-tilted power spectrum leading to primordial black hole formation across a wide mass range.

Findings

Primordial black holes with masses ~10^{20} - 10^{38} g can account for dark matter.

The model allows formation of ~10^5 solar mass black holes as supermassive black hole seeds.

The power spectrum tilt is crucial for producing the necessary black hole abundance.

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.