Revisiting $Λ$CDM extensions in light of re-analyzed CMB data
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| Format: | Preprint |
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2025
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| author | Asorey, Jacobo Pérez, Javier de Cruz |
| author_facet | Asorey, Jacobo Pérez, Javier de Cruz |
| contents | 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 $Λ$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 $Λ$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 $Ω_k<0$ 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_13537 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Revisiting $Λ$CDM extensions in light of re-analyzed CMB data Asorey, Jacobo Pérez, Javier de Cruz Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology 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 $Λ$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 $Λ$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 $Ω_k<0$ 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. |
| title | Revisiting $Λ$CDM extensions in light of re-analyzed CMB data |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2506.13537 |