Revisiting $\Lambda$CDM extensions in light of re-analyzed CMB data

Abstract

In the last years with the increasing precision in cosmological observations we have been able to establish a standard model of cosmology, the so-called $\Lambda$CDM, but also find some tensions between cosmological probes that are difficult to explain within the context of this model. We tested several phenomenological extensions of the $\Lambda$CDM with the newest datasets from the chain CMB+BAO+SNIa, to see whether they are able to alleviate the aforementioned tensions. We find that when the updated version of the Planck CMB likelihood (PR4 \texttt{LoLLiPoP} and \texttt{HiLLiPoP}), with respect to the more used likelihoods (PR4 \texttt{CamSpec} and PR3), is considered, the lensing anomaly is reduced, and the preference for $A_L>1$ and ${\Omega }_k<0$ is less significant. From the CMB+BAO+SNIa dataset, in the context of the parameterization $w_0{w}_a$CDM, we find a preference for a time-evoling dark energy over the rigid cosmological constant which is consistent with the most recent results from DESI collaboration.

29 pages, 5 Figures and 5 Tables. Version accepted for publication in PDU