Low variance at large scales of WMAP 9 year data

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 th...

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Published inJournal of cosmology and astroparticle physics Vol. 2013; no. 7; pp. i - 16
Main Authors Gruppuso, A, Natoli, P, Paci, F, Finelli, F, Molinari, D, De Rosa, A, Mandolesi, N
Format Journal Article
LanguageEnglish
Published United States 01.07.2013
Subjects
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Byproducts
Computer simulation
COMPUTERIZED SIMULATION
COSMOLOGICAL CONSTANT
COSMOLOGICAL MODELS
Cosmology
Deviation
ENERGY SPECTRA
MONTE CARLO METHOD
NONLUMINOUS MATTER
Optimization
POLARIZATION
Power spectra
Sky
Variance
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Summary: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 > or = 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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ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2013/07/047