Revisiting ΛCDM extensions in light of re-analyzed CMB data

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 ΛCDM, 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 ΛCDM 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 LoLLiPoP and HiLLiPoP ), with respect to the more used likelihoods (PR4 CamSpec and PR3), is considered, the lensing anomaly is reduced, and the preference for A L > 1 and Ω 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.

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Journal
Physics of the Dark Universe
Published
2026-03-21
DOI
https://doi.org/10.1016/j.dark.2026.102283
Primary Topic
Financial Risk and Volatility Modeling
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article
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article

Revisiting ΛCDM extensions in light of re-analyzed CMB data

J. Asorey, Javier de Cruz Pérez
Physics of the Dark Universe
Financial Risk and Volatility Modeling
article

Revisiting ΛCDM extensions in light of re-analyzed CMB data

J. Asorey, Javier de Cruz Pérez
article en

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 ΛCDM, 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 ΛCDM 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 LoLLiPoP and HiLLiPoP ), with respect to the more used likelihoods (PR4 CamSpec and PR3), is considered, the lensing anomaly is reduced, and the preference for A L > 1 and Ω 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.

Physics of the Dark UniverseVol. 52
Universidad de Zaragoza (ES), University of Córdoba (ES)
Openalex Percentile: Top 17%
Financial Risk and Volatility Modeling
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