Primordial Black-Hole Dark Matter via Warm Natural Inflation

TL;DR

This paper demonstrates that warm natural inflation can produce primordial black holes in the right mass range to account for all dark matter, while remaining consistent with cosmic microwave background observations and effective field theory limits.

Contribution

It shows that warm natural inflation can generate primordial black holes as dark matter candidates without exceeding the Planck scale constraints.

Findings

Primordial black holes can be produced in the mass range $10^{-16} - 10^{-11} M_{\odot}$.

The model satisfies CMB constraints without surpassing the Planck scale.

WNI provides conditions for PBH formation compatible with observational data.

Abstract

We report on a study of the natural warm inflationary paradigm (WNI). We show two important new results arise in this model. One is that the observational constraints on the primordial power spectrum from the cosmic microwave background (CMB) can be satisfied without going beyond the Planck scale of the effective field theory. The second is that WNI can inevitably provide perfect conditions for the production of primordial black holes (PBHs) in the golden window of black-hole mass range ($10^{-16} -10^{-11}M_{\odot}$) where it can account for all of the the dark matter content of the universe while satisfying observational constraints.