Published July 1, 2013
| Version v1
Journal article
Low variance at large scales of WMAP 9 year data
- 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)
- 4. Dipartimento di Fisica e Astronomia, Università degli Studi di Bologna, viale Berti Pichat 6/2, I-40127 Bologna (Italy)
Description
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
Availability note (English)
Available from http://dx.doi.org/10.1088/1475-7516/2013/07/047Additional details
Identifiers
Publishing Information
- Journal Title
- Journal of Cosmology and Astroparticle Physics
- Journal Volume
- 2013
- Journal Issue
- 07
- Journal Page Range
- p. 047
- ISSN
- 1475-7516
INIS
- Country of Publication
- United States
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 45104048
- Subject category
- S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;
- Descriptors DEI
- COMPUTERIZED SIMULATION; COSMOLOGICAL CONSTANT; COSMOLOGICAL MODELS; ENERGY SPECTRA; MONTE CARLO METHOD; NONLUMINOUS MATTER; POLARIZATION
- Descriptors DEC
- CALCULATION METHODS; MATHEMATICAL MODELS; MATTER; SIMULATION; SPECTRA