Double inflation as a single origin of primordial black holes for all dark matter and LIGO observations

TL;DR

This paper proposes a single inflation model that can produce primordial black holes across a broad mass spectrum, potentially accounting for all dark matter and explaining LIGO gravitational wave observations.

Contribution

It introduces a concrete inflationary scenario that generates PBHs spanning from subsolar to stellar masses, unifying dark matter and LIGO event explanations.

Findings

PBHs can constitute all dark matter within a broad mass range.

The model produces PBHs around 10^{-13} solar masses and 10 solar masses.

Uncertainty in microlensing constraints affects PBH abundance limits.

Abstract

Primordial Black Hole (PBH) is one of the leading non-particle candidates for dark matter (DM). Although several observations severely constrain the amount of PBHs, it is recently pointed out that there is an uncertainty on the microlensing constraints below $\sim 10^{-10} M_\odot$ which was ignored originally but may weaken the constraints significantly. In this paper, facing this uncertainty, we investigate the possibility that PBHs can make up all DM in a broad mass spectrum. Moreover, we propose a concrete inflation model which can simultaneously produce PBHs for all DM in a broad mass spectrum around $\mathcal O(10^{-13}) M_\odot$ and PBHs for LIGO events in a sharp mass spectrum at $\mathcal O(10) M_\odot$.