Compact extra dimensions as the source of primordial black holes

TL;DR

This paper explores how compact extra dimensions in multidimensional $f(R)$-gravity can lead to the formation of primordial black holes through the collapse of dense domain walls produced during inflation.

Contribution

It introduces a model linking extra dimensions and $f(R)$-gravity to primordial black hole formation via domain wall collapse.

Findings

Primordial black holes can form during reheating due to domain wall collapse.

Compact extra dimensions influence the effective scalar field potential.

The model connects multidimensional gravity with early universe black hole production.

Abstract

We discuss the model of the primordial black holes formation at the reheating stage. These small massive black holes appear due to specific properties of the compact extra dimensions. The latter gives rise the low energy model containing the effective scalar field potential capable for the domain walls production. Formed during inflation, these walls are quite dense so they collapse soon after inflation ends. The discussion is performed within the scope of multidimensional $f(R)$-gravity.