2023
DOI: 10.48550/arxiv.2302.14300
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On the consistency of $Λ$CDM with CMB measurements in light of the latest Planck, ACT, and SPT data

Abstract: Using Gaussian Processes we perform a thorough, non-parametric consistency test of the ΛCDM model when confronted with state-of-the-art TT, TE and EE measurements of the anisotropies in the Cosmic Microwave Background by Planck, ACT, and SPT collaborations. We find no statistically significant deviation from ΛCDM's best fit predictions when looking for signatures in the residuals. The results of SPT are in good agreement with the ΛCDM best fit predictions to Planck data, while the results of ACT are only margi… Show more

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“…Consequently, also the lensing amplitude aligns with the expected values in the CDM model. Nonetheless, ACT and SPT data in turn show other mild yet rele v ant de viations from the CDM scenario (Di Valentino et al 2022 ;Calder ón et al 2023 ;Di Valentino et al 2023 ), including a ∼2.7 σ discrepancy in the scalar spectral index n s between Planck ( n s = 0.9649 ± 0.0044) and ACT ( n s = 1.008 ± 0.015) that represents a new potential challenge for inflationary cosmology. As with the other tensions mentioned previously, this n s discrepancy could result from a statistical fluctuation, to a (yet unknown) systematic effect in the ACT or Planck data, or a departure from the theoretical CDM framework by assuming canonical inflation as the dominant mechanism for producing the perturbations in the early universe.…”
mentioning
confidence: 98%
“…Consequently, also the lensing amplitude aligns with the expected values in the CDM model. Nonetheless, ACT and SPT data in turn show other mild yet rele v ant de viations from the CDM scenario (Di Valentino et al 2022 ;Calder ón et al 2023 ;Di Valentino et al 2023 ), including a ∼2.7 σ discrepancy in the scalar spectral index n s between Planck ( n s = 0.9649 ± 0.0044) and ACT ( n s = 1.008 ± 0.015) that represents a new potential challenge for inflationary cosmology. As with the other tensions mentioned previously, this n s discrepancy could result from a statistical fluctuation, to a (yet unknown) systematic effect in the ACT or Planck data, or a departure from the theoretical CDM framework by assuming canonical inflation as the dominant mechanism for producing the perturbations in the early universe.…”
mentioning
confidence: 98%