Cosmology with cosmic voids

TL;DR

This paper discusses how cosmic voids can be used for cosmological studies, emphasizing the importance of understanding redshift-space effects for unbiased measurements and proposing theoretical foundations for such analyses.

Contribution

It provides a theoretical framework for analyzing redshift-space effects on void-based cosmological tests using the void size function and void-galaxy cross-correlation.

Findings

Redshift-space effects significantly impact void measurements.

Modern surveys have high enough signal-to-noise ratios for void studies.

Theoretical foundations enable reliable cosmological constraints from voids.

Abstract

Cosmic voids constitute promising cosmological laboratories. However, a full description of all the redshift-space effects that affect observational measurements is mandatory in order to obtain unbiased cosmological constraints. We make a description in a nutshell of these effects and lay the theoretical foundations for designing reliable cosmological tests based on the void size function and the void-galaxy cross-correlation function. We show that modern spectroscopic surveys offer a high signal-to-noise ratio to detect and study them.