Planck-PR4 anisotropy spectra show better consistency with general relativity

Wepresent the results from a series of analyses on two parametric tests of gravity that modify the growth of linear, subhorizon matter perturbations in the ΛCDM model. The first test, known as the ðμ;ΣÞ framework, modifies the Poisson and lensing equations from general relativity (GR). The second test introduces the growth index γ, which directly affects the time evolution of matter density perturbations. Our study is motivated by results from the analysis of the Planck-PR3 2018 spectra, which indicate a preference for Σ0 ≠ 0 and γ0 > 0.55, both of which deviate from the ΛCDM predictions at a significance level of ∼2.5σ. To clarify the nature of these anomalous results and understand how the lensing anomaly fits into the picture, we analyze the most recent Planck-PR4 spectra extracted from the updated NPIPE maps. Overall, the Planck-PR4 data show better consistency with GR. The updated likelihood Camspec provides constraints on Σ0 and γ0 that are consistent with GR within 1.5σ and 2σ, respectively. The updated likelihoods HiLLiPoP and LoLLiPoP show even closer agreement, with all parameter values consistent with a ΛCDM cosmology within 1σ. This enhanced consistency is closely correlated with the lensing anomaly. Across the different likelihoods, the tendency of Σ0 and γ0 to drift toward nonstandard values matches the observed preference for AL > 1, both of which are significantly reduced or disappear within the Planck-PR4 data.