Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2013/07/047
Keywords
CMBR theory; CMBR experiments
Funding
- NASA Office of Space Science
- ASI through ASI/INAF Agreement [I/072/09/0]
- MIUR through PRIN [2009XZ54H2]
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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 considered masks in this analysis, which cover at least the 54% of the sky, the WMAP 9 CMB sky and Lambda CDM are incompatible at >= 99.94% C.L. at large angles (>5 degrees). 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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