2013

Planck 2013 results. XVII. Gravitational lensing by large-scale structure

Planck Collaboration, Ade, P. A. R., Aghanim, N. et al.

Understand

On the arcminute angular scales probed by Planck, the CMB anisotropies are gently perturbed by gravitational lensing.

Here we present a detailed study of this effect, detecting lensing independently in the 100, 143, and 217GHz frequency bands with an overall significance of greater than 25sigma.
We use the temperature-gradient correlations induced by lensing to reconstruct a (noisy) map of the CMB lensing potential, which provides an integrated measure of the mass distribution back to the CMB last-scattering surface.
Our lensing potential map is significantly correlated with other tracers of mass, a fact which we demonstrate using several representative tracers of large-scale structure.

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