Excess of lensing amplitude in the Planck CMB power spectrum

Abstract

Precise measurements of the Planck cosmic microwave background (CMB) angular power spectrum (APS) at small angles have stimulated accurate statistical analyses of the lensing amplitude parameter $A_L$. To confirm if it satisfies the value expected by the flat-$\Lambda$CDM concordance model, i.e. $A_L=1$, we investigate the spectrum difference obtained as: the difference of the measured Planck CMB APS and the Planck best-fit $\Lambda$CDM APS model. To know if this residual spectrum corresponds to statistical noise or if it has a hiden signature that can be accounted for with a larger lensing amplitude $A_L>1$, we apply the Ljung-Box statistical test and find, with high statistical significance, that the spectrum difference is not statistical noise. This spectrum difference is then analysed in detail using simulated APS, based on the Planck $\Lambda$CDM best-fit model, where the lensing amplitude is a free parameter. We explore different binnations of the multipole order \,$\ell$\, and look for the best-fit lensing amplitude parameter that accounts for the spectrum difference in a ${\chi }^2$ procedure. We find that there is an excess of signal that is well explained by a $\Lambda$CDM APS with a non-null lensing amplitude parameter $A_{lens}$, with values in the interval $[0.10,0.29]$ at 68\% confidence level. Furthermore, the lensing parameter in the Planck APS should be $1+A_{lens}>1$ at $\sim 3\sigma$ of statistical confidence. Additionally, we perform statistical tests that confirm the robustness of this result. Important to say that this excess of lensing amplitude, not accounted in the Planck's flat-$\Lambda$CDM model, could have an impact on the theoretical expectation of large-scale structures formation once the scales where it was detected correspond to these matter clustering processes.

arXiv commentJCAP published version

References in corpus (35)

• Planck 2015 results. XIII. Cosmological parameters
• The Cosmic Linear Anisotropy Solving System (CLASS) II: Approximation schemes
• Planck 2018 results. V. CMB power spectra and likelihoods
• Weak Gravitational Lensing of the CMB
• Massive neutrinos and cosmology
• Planck evidence for a closed Universe and a possible crisis for cosmology
• Planck intermediate results. XLVI. Reduction of large-scale systematic effects in HFI polarization maps and estimation of the reionization optical depth
• Cosmic Microwave Weak lensing data as a test for the dark universe
• Cosmological constraints in extended parameter space from the Planck 2018 Legacy release
• Constraints on Cosmological Parameters from the 500 deg${}^2$ SPTpol Lensing Power Spectrum
• Cross-correlation of Planck CMB Lensing and CFHTLenS Galaxy Weak Lensing Maps
• Parity Asymmetry in the CMBR Temperature Power Spectrum
• The growth rate of cosmic structures in the local Universe with the ALFALFA survey
• Cornering the Planck $A_{lens}$ tension with future CMB data
• Can a primordial magnetic field originate large-scale anomalies in WMAP data?
• Signals of Statistical Anisotropy in WMAP Foreground-Cleaned Maps
• Tomographic analyses of the CMB lensing and galaxy clustering to probe the linear structure growth
• Alignments of parity even/odd-only multipoles in CMB
• The homogeneity scale and the growth rate of cosmic structures
• Observational constraints on Starobinsky $f(R)$ cosmology from cosmic expansion and structure growth data
• Cross-correlation between Subaru Hyper Suprime-Cam Galaxy Weak Lensing and Planck Cosmic Microwave Background Lensing
• Isotropy analyses of the Planck convergence map
• CMB and matter power spectra with non-linear dark-sector interactions
• North-South non-Gaussian asymmetry in PLANCK CMB maps
• Lack-of-correlation anomaly in CMB large scale polarisation maps
• Clustering of Local Extrema in Planck CMB maps
• Topological signatures in CMB temperature anisotropy maps
• Mapping the large-angle deviation from Gaussianity in simulated CMB maps
• CMB low multipole alignments in the $\mathbf{\Lambda }$CDM and Dipolar models
• Isotropy statistics of CMB hot and cold spots
• Detection of cross-correlation between CMB Lensing and low-density points
• Local patch analysis for testing statistical isotropy of the Planck convergence map
• The CMB cold spot under the lens: ruling out a supervoid interpretation
• Cross-correlation analysis of CMB with foregrounds for residuals
• Level correlations of the CMB temperature angular power spectrum

Cited by in corpus (5)

• DESI 2024 VII: Cosmological Constraints from the Full-Shape Modeling of Clustering Measurements
• Modified Gravity Constraints from the Full Shape Modeling of Clustering Measurements from DESI 2024
• The bulk flow motion and the Hubble-Lema\^ıtre law in the Local Universe with the ALFALFA survey
• Impact of Low ell's on Large Scale Structure Anomalies
• Constraints on the normal branch of DGP gravity from SPT galaxy clusters with DES and HST weak-lensing mass calibration and from Planck PR4 CMB anisotropies