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 $\Omega_\mathrm{b}h^2$.
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http://hal.in2p3.fr/in2p3-01220875
Contributor : Sabine Starita <>
Submitted on : Tuesday, October 27, 2015 - 9:27:10 AM
Last modification on : Thursday, January 11, 2018 - 6:14:22 AM

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

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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. 2015. ⟨in2p3-01220875⟩

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