Primordial Black Holes and the String Swampland

TL;DR

This paper explores how string swampland conjectures impose constraints on early universe cosmology, affecting primordial black hole formation and dark matter models within effective field theories.

Contribution

It demonstrates the implications of swampland criteria on primordial black hole formation and dark matter, linking quantum gravity constraints to cosmological phenomena.

Findings

Swampland conjectures restrict scalar field behavior in early universe models.

Constraints influence the formation and abundance of primordial black holes.

Implications for dark matter models derived from quantum gravity considerations.

Abstract

The "swampland conjectures" have been recently suggested as a set of criteria to assess if effective field theories (EFTs) are consistent with a quantum gravity embedding. Such criteria, which restrict the behavior of scalar fields in the theory, have strong implications for cosmology in the early universe. As we demonstrate, they will also have direct consequences for formation of primordial black holes (PBHs) and dark matter (DM).