Voids and Halos in Voids statistics as a probe of the Expansion History of the Universe

TL;DR

This paper explores how void and halo statistics within the cosmic web, analyzed through various Excursion Set Theory frameworks, can serve as probes to distinguish cosmological models and understand the universe's expansion history.

Contribution

It compares void and halo-in-void number densities in different EST models and cosmologies, highlighting potential for model discrimination based on these statistics.

Findings

Differences in void and halo-in-void densities depend on collapse models and EST frameworks.

Potential to distinguish cosmological models using halo-in-void counts at redshift 1.0-2.5.

Maximum model differentiation observed around redshift 1.9.

Abstract

Structures in the Universe are arranged into the cosmic web. Distributions, statistics, and evolutions of the structures can be used as probes for cosmological models. We investigate the number density of voids and dark matter halos-in-voids in the Excursion Set Theory (EST). We study the Markov and non-Markov frameworks of EST in both spherical and ellipsoidal collapse models. Afterward, we compare the number density of voids and halos-in-voids in the standard $\Lambda$CDM and the reconstructed model. The reconstructed model is a model-independent reconstruction based on background observations. This work explores the effects of the collapse model barrier in the different EST frameworks on the statistics of voids and the statistics of halos-in-voids. Finally, we find the hint that cosmological models can be distinguished by the number density of halos-in-voids in the $1.0-2.5$ redshift range. The maximum difference is observed in $z\sim1.9$.