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

TL;DR

This paper reevaluates extensions of the $ m{ extLambda}$CDM model using recent, high-precision cosmological data, finding reduced anomalies and a preference for evolving dark energy.

Contribution

It tests several phenomenological $ m{ extLambda}$CDM extensions with updated datasets, revealing diminished tensions and support for dynamic dark energy.

Findings

Updated likelihoods reduce lensing anomaly and related tensions.

Preference for evolving dark energy over a cosmological constant.

Less significant evidence for $A_L>1$ and $ m{ extOmega_k}<0$.

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 $w_0w_a$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.