Primordial Black Holes in Higgs-$R^2$ Inflation as a Whole Dark Matter

TL;DR

This paper demonstrates that primordial black holes produced in a Higgs-$R^2$ inflation model could account for most dark matter, with masses around 10^{-16} to 10^{-15} solar masses, consistent with observations.

Contribution

It introduces a minimal UV extension to Higgs inflation including an $R^2$ term that naturally produces primordial black holes as dark matter candidates.

Findings

Primordial black holes have masses in the range (10^{-16}, 10^{-15}) solar masses.

The abundance of these black holes could account for the majority of dark matter.

Model parameters align with Standard Model and Planck data.

Abstract

Primordial black holes are produced in a minimal UV extension to the Higgs inflation with an included $R^2$ term. We show that for parameters consistent with Standard Model measurements and Planck observation results lead to $M_{\rm PBH} \in (10^{-16}, 10^{-15}) M_\odot$ primordial black holes with significant abundance, which may consist the majority of dark matter.