# Relieving tensions related to the lensing of CMB temperature power spectra

Abstract : The angular power spectra of the CMB temperature anisotropies from the recently released Planck data exhibit the intriguing feature of apparently presenting too much gravitational lensing distortion with respect to expectations from a standard $\Lambda$CDM cosmology. This is quantified by the control parameter $A_L$, which is found to deviate from unity by more than $2\sigma$. This feature also shows up in a tension between low and high $\ell$ measurements of the reionization optical depth $\tau$. Using the Hillipop likelihood, built from the Planck data, the tension is reduced. By combining it with the vey high $\ell$ measurements of the ACT and SPT experiments, we obtain consistent results for $\tau$ and measure $A_L = 1.03 \pm 0.08$. After investigating the reasons for this improvement and the robustness of our results, we evaluate the impact on the $\Lambda$CDM parameters and show that regularizing $A_L$ also leads to effects on the scalar perturbations amplitude $A_\mathrm{s}$ and the baryonic energy density $\Omega_\mathrm{b}h^2$.
Type de document :
Pré-publication, Document de travail
LAL 15-397. Submitted to Astronomy & Astrophysics 2015
Domaine :

http://hal.in2p3.fr/in2p3-01220875
Contributeur : Sabine Starita <>
Soumis le : mardi 27 octobre 2015 - 09:27:10
Dernière modification le : jeudi 11 janvier 2018 - 06:14:22

### Identifiants

• HAL Id : in2p3-01220875, version 1
• ARXIV : 1510.07600

### Citation

F. Couchot, S. Henrot-Versillé, O. Perdereau, Stéphane Plaszczynski, B. Rouillé D’orfeuil, et al.. Relieving tensions related to the lensing of CMB temperature power spectra. LAL 15-397. Submitted to Astronomy & Astrophysics 2015. 〈in2p3-01220875〉

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