Constraints on Cold Dark Matter Accelerating Cosmologies and Cluster Formation

TL;DR

This paper explores cosmological models driven solely by gravitationally induced cold dark matter creation, showing they can match observations and predict different structure growth compared to standard dark energy models.

Contribution

It introduces a CCDM cosmology with a single free parameter that fits observational data and predicts distinctive structure formation features without dark energy.

Findings

Best-fit matter density parameter ${ ilde{oldsymbol{ ext{Ω}}}}_{m}= 0.28\u00b10.01$

CCDM predicts faster growth of perturbations than $ ext{Λ}$CDM

Model aligns with large scale structure observations

Abstract

We discuss the properties of homogeneous and isotropic flat cosmologies in which the present accelerating stage is powered only by the gravitationally induced creation of cold dark matter (CCDM) particles ($\Omega_{m}=1$). For some matter creation rates proposed in the literature, we show that the main cosmological functions such as the scale factor of the universe, the Hubble expansion rate, the growth factor and the cluster formation rate are analytically defined. The best CCDM scenario has only one free parameter and our joint analysis involving BAO + CMB + SNe Ia data yields ${\tilde{\Omega}}_{m}= 0.28\pm 0.01$ ($1\sigma$) where $\tilde{{\Omega}}_{m}$ is the observed matter density parameter. In particular, this implies that the model has no dark energy but the part of the matter that is effectively clustering is in good agreement with the latest determinations from large scale structure. The growth of perturbation and the formation of galaxy clusters in such scenarios are also investigated. Despite the fact that both scenarios may share the same Hubble expansion, we find that matter creation cosmologies predict stronger small scale dynamics which implies a faster growth rate of perturbations with respect to the usual $\Lambda$CDM cosmology. Such results point to the possibility of a crucial observational test confronting CCDM with $\Lambda$CDM scenarios trough a more detailed analysis involving CMB, weak lensing, as well as the large scale structure.