A. Gruppuso, P. Natoli, F. Paci, F. Finelli, D. Molinari, A. De Rosa, N. Mandolesi
We use an optimal estimator to study the variance of the WMAP 9 CMB field at low resolution, in both temperature and polarization. Employing realistic Monte Carlo simulation, we find statistically significant deviations from the $\Lambda$CDM model in several sky cuts for the temperature field. For the largest mask considered in this analysis, which leaves 46% of the sky, the CMB sky and $\Lambda$CDM are incompatible at >99.94% C.L. at large angles ($>5^\circ$). We find instead no anomaly in polarization. As a byproduct of our analysis, we present new, optimal estimates of the WMAP 9 CMB angular power spectra from the WMAP 9 year data at low resolution.
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http://arxiv.org/abs/1304.5493
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