Degeneracy between CCDM and $\Lambda$CDM cosmologies

TL;DR

This paper compares the skewness in CCDM and ΛCDM cosmologies beyond linear perturbations, showing they produce indistinguishable signatures in this observable, thus challenging their differentiation.

Contribution

It provides an explicit calculation of skewness in CCDM models and demonstrates their degeneracy with ΛCDM in this observable.

Findings

CCDM and ΛCDM models have identical skewness signatures.

Skewness cannot distinguish between the two cosmologies.

The study extends analysis beyond linear perturbations.

Abstract

The creation of cold dark matter cosmology model is studied beyond the linear perturbation level. The skewness is explicitly computed and the results are compared to those from the $\Lambda$CDM model. It is explicitly shown that both models have the same signature for the skewness and cannot be distinguished by using this observable.