Low variance at large scales of WMAP 9 year data

Journal Article · Mon Jul 01 00:00:00 EDT 2013 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2013/07/047· OSTI ID:22282688

Gruppuso, A.; Finelli, F.; Rosa, A. De; Mandolesi, N. ^[1]; Natoli, P. ^[2]; Paci, F. ^[3]

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1. INAF-IASF Bologna, Via P. Gobetti 101, I-40129, Bologna (Italy)
2. Dipartimento di Fisica e Scienze della Terra, Università degli Studi di Ferrara, via Saragat 1, I-44100 Ferrara (Italy)
3. SISSA - Scuola Internazionale Superiore di Studi Avanzati, via Bonomea 265, I-34136 Trieste (Italy)

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 ΛCDM 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 ΛCDM are incompatible at ≥ 99.94% C.L. at large angles ( > 5°). 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.

• OSTI ID: 22282688
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2013, Issue 07; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
COMPUTERIZED SIMULATION
COSMOLOGICAL CONSTANT
COSMOLOGICAL MODELS
ENERGY SPECTRA
MONTE CARLO METHOD
NONLUMINOUS MATTER
POLARIZATION