Skewness of matter distribution in clustering dark energy cosmologies

TL;DR

This paper investigates how dark energy perturbations influence the skewness of matter distribution, demonstrating that high-order statistics can distinguish between clustering and non-clustering dark energy models.

Contribution

It provides the first detailed calculation of the skewness of matter distribution considering dark energy perturbations, highlighting their significant impact on cosmological diagnostics.

Findings

Dark energy perturbations significantly affect matter skewness.

High-order statistics can differentiate clustering dark energy models.

Dark energy perturbations can alter skewness by a factor of about 3.

Abstract

We calculate the skewness (the third moment $S_3$) of matter distribution in dynamical dark energy cosmologies. We pay particular attention to the impact of dark energy perturbations on this quantity. There is indeed a clear signature of dark energy perturbations on this quantity. By properly allowing dark energy perturbations we show that their impact on $S_3$ is strong enough (a factor $\sim 3$ greater) to easily discriminate between clustering and non-clustering dark energy cosmologies. This indicates that high order statistics of the cosmic density field are useful to the study of dark energy models and are potentially able to rule out clustering dark energy cosmologies.