Primordial Black Holes from No-Scale Supergravity

TL;DR

This paper demonstrates how a modified no-scale supergravity model can produce primordial black holes accounting for up to 20% of dark matter, while satisfying key cosmological constraints.

Contribution

It introduces a specific modification to the Kähler potential in no-scale supergravity to generate primordial black holes consistent with observational data.

Findings

Achieves up to 20% dark matter from primordial black holes

Satisfies Planck constraints on spectral index and tensor-to-scalar ratio

Uses a single parameter modification in the supergravity model

Abstract

We calculate the primordial black hole abundance in the context of a Wess-Zumino type no-scale supergravity model. We modify the K\"ahler potential, by adding an extra exponential term. Using just one parameter in the context of this model, we are able to satisfy the Planck cosmological constraints for the spectral index $n_s$, the tensor-to-scalar ratio $r$, and to produce up to $\sim 20\%$ of the dark matter of the Universe in the form of primordial black holes.