C. Sofia Carvalho, Ismael Tereno, Spyros Basilakos
We attempt to make a direct measurement of the weak lensing signal from the WMAP 7-year data. We apply the real-space implementation of the optimal quadratic estimator on the maps produced by the W-band Differencing Assemblies. We obtain a weak lensing amplitude parameter of $A_{L}=0.98\pm2.50$ after correcting for several sources of bias. The significance of the estimation improves to $A_{L}=1.55\pm0.93$ when information from WMAP simulations is used. Despite the demonstrated insensitivity of the real-space estimator to uncorrelated noise, we conclude that this detection is not statistically significant. We expect that a full-sky, higher-sensitivity experiment such as Planck will allow us to make a more significant measurement.
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http://arxiv.org/abs/1212.6658
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