A Study of Gaussianity in CMB band maps
arXiv:1004.0207 · doi:10.1142/S0218271810017391
Abstract
The detection of non-Gaussianity in the CMB data would rule out a number of inflationary models. A null detection of non-Gaussianity, instead, would exclude alternative models for the early universe. Thus, a detection or non-detection of primordial non-Gaussianity in the CMB data is crucial to discriminate among inflationary models, and to test alternative scenarios. However, there are various non-cosmological sources of non-Gaussianity. This makes important to employ different indicators in order to detect distinct forms of non-Gaussianity in CMB data. Recently, we proposed two new indicators to measure deviation from Gaussianity on large angular scales, and used them to study the Gaussianity of the raw band WMAP maps with and without the KQ75 mask. Here we extend this work by using these indicators to perform similar analyses of deviation from Gaussianity of the foreground-reduced Q, V, and W band maps. We show that there is a significant deviation from Gaussianity in the considered full-sky maps, which is reduced to a level consistent with Gaussianity when the KQ75 mask is employed.
5 pages, 2 PS figures, uses ws-ijmpd.cls ; to be published in the International Journal of Modern Physics D
References in corpus (33)
- HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Data Processing, Sky Maps, and Basic Results
- Non-Gaussianity from Inflation: Theory and Observations
- CMB bispectrum from primordial magnetic fields on large angular scales
- A Scale-Dependent Power Asymmetry from Isocurvature Perturbations
- CMB Temperature Anisotropy from Broken Spatial Isotropy due to an Homogeneous Cosmological Magnetic Field
- A high-significance detection of non-Gaussianity in the WMAP 5-year data using directional spherical wavelets
- New Constraints on the Primordial Magnetic Field
- Mapping the large-scale anisotropy in the WMAP data
- On the CMB large-scales angular correlations
- Alignment tests for low CMB multipoles
- A low CMB variance in the WMAP data
- Non-isotropy in the CMB power spectrum in single field inflation
- Testing Isotropy of Cosmic Microwave Background Radiation
- Alignment and signed-intensity anomalies in WMAP data
- A Complete Statistical Analysis for the Quadrupole Amplitude in an Ellipsoidal Universe
- Anomalous CMB north-south asymmetry
- Constraints on Primordial Non-Gaussianity from a Needlet Analysis of the WMAP-5 Data
- Can a primordial magnetic field originate large-scale anomalies in WMAP data?
- Signals of Statistical Anisotropy in WMAP Foreground-Cleaned Maps
- Unveiling Hidden Patterns in CMB Anisotropy Maps
- Needlet Bispectrum Asymmetries in the WMAP 5-year Data
- Temperature Fluctuations of the Cosmic Microwave Background Radiation: A Case of Nonextensivity?
- Non-Gaussianity analysis on local morphological measures of WMAP data
- Deviation from Gaussianity in the cosmic microwave background temperature fluctuations
- Null Energy Condition Violation and Classical Stability in the Bianchi I Metric
- Analysis of non-Gaussian CMB maps based on the N-pdf. Application to WMAP data
- A note on the large-angle anisotropies in the WMAP cut-sky maps
- Searching for non-Gaussianity in the WMAP data
- Is the cold spot responsible for the CMB North-South asymmetry?
- Too few spots in the cosmic microwave background
- Erratum: Statistical anisotropy in the inflationary universe
- Testing Gaussianity in the WMAP data of OT foreground reduced map