Can UV meet IR in the Swiss cheese?

TL;DR

This paper investigates how ultraviolet modifications to regular black holes embedded in an expanding universe influence cosmic expansion and explores their potential role in explaining the universe's accelerated expansion, constrained by observational data.

Contribution

It introduces various regular black hole models within cosmology and analyzes their effects on universe expansion, linking UV corrections to observable cosmic acceleration.

Findings

Different black hole models yield distinct cosmological implications.

UV corrections can potentially account for accelerated expansion.

Best observational fit suggests horizonless compact objects as regular black holes.

Abstract

We consider the embedding of regular black holes in an expanding universe and study how the ultraviolet modifications to the Schwarzschild geometry that regularize the black hole singularity affect the exterior universe's expansion rate. We consider several proposals for the regular black hole geometry and obtain the corresponding Friedmann equations for a universe filled only with dust and black holes. We show that different proposals have different implications which may be distinguished. We then test the hypothesis that the UV corrections to the black hole geometry may be responsible for the current phase of accelerated expansion. To this aim we constrain the value of the regular black hole UV cutoff parameter from observations. Interestingly we find that the best fit is obtained by values of the parameter corresponding to regular horizonless compact objects.