Skewness as a test of dark energy perturbations

TL;DR

This paper explores how dark energy perturbations influence the skewness of large-scale matter distribution, providing numerical tools to test cosmological models against future observational data.

Contribution

It introduces a numerical framework to evaluate the impact of dark energy parameters on matter skewness, aiding future cosmological tests.

Findings

Skewness depends on dark energy parameters like sound speed and density.

Numerical fits for skewness as a function of cosmological parameters.

Potential to discriminate dark energy models with upcoming data.

Abstract

We investigate the role played by dark energy perturbations in the skewness $S_3$ of large-scale matter distribution. We consider a two-fluid universe composed by matter and dark energy, with perturbations in both components, and we estimate numerically the skewness of the matter density field as a function of the dark energy parameters. We characterize today's $S_3$ value for quintessence and phantom dark energy cosmologies as well as its dependence on the matter density parameter $\Omega_{m0}$ and the dark energy sound speed $c^2_s$ with accurate numerical fitting. These fits can be used to test cosmology against future high quality data on large scale structure.