A high-significance detection of non-Gaussianity in theWMAP5-yr data using directional spherical wavelets

2008/03/31 by J. D. McEwen, M. P. Hobson, A. Lasenby +3 · 3 citations
Mathematics · Physics and Astronomy · #Anisotropy #Artificial intelligence #Astrophysics #CMB cold spot #Cosmic background radiation #Cosmic microwave background #Cosmology and Gravitation Theories #Discrete wavelet transform #Gaussian #Morlet wavelet #Non-Gaussianity #Optics #Physics #Quantum mechanics #SIGNAL (programming language) #Scientific Research and Discoveries #Statistical and numerical algorithms #Wavelet #Wavelet transform #astro-ph

paper · pdf · doi:10.1111/j.1365-2966.2008.13406.x

published as Mon.Not.Roy.Astron.Soc. 388 (2008) 659-662 · 4 pages, 4 figures, replaced to match version accepted by MNRAS, masks available for download

arxiv created 2008/04/29 · openalex publication_date 2008/06/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We repeat the directional spherical real Morlet wavelet analysis, used previously to detect non-Gaussianity in the Wilkinson Microwave Anisotropy Probe (WMAP) 1- and 3-yr data, on the WMAP 5-yr data. The non-Gaussian signal detected previously is present in the 5-yr data at a slightly increased statistical significance of approximately 99 per cent. Localized regions that contribute most strongly to the non-Gaussian signal are found to be very similar to those detected in the previous releases of the WMAP data. When the localized regions detected in the 5-yr data are excluded from the analysis, the non-Gaussian signal is eliminated.

Citations

• Examination of Evidence for a Preferred Axis in the Cosmic Radiation Anisotropy
• Probing Non-Gaussianity In The Cosmic Microwave Background Anisotropies: One Point Distribution Function
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• FIVE-YEARWILKINSON MICROWAVE ANISOTROPY PROBEOBSERVATIONS: COSMOLOGICAL INTERPRETATION
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Cited by

• Foreground influence on primordial non-Gaussianity estimates: needlet analysis ofWMAP5-year data
• Complex Data Processing: Fast Wavelet Analysis on the Sphere
• Non-Gaussian inflationary perturbations from the dS/CFT correspondence
• Halo abundances in thefnlmodel
• The initial shear field in models with primordial local non-Gaussianity and implications for halo and void abundances

Related

• Detection of a non-Gaussian spot in WMAP
• Looking for non-Gaussianity in the COBE-DMR data with spherical wavelets
• Multivariate Non-Normality in the WMAP 1st Year Data
• A Statistically Robust 3-Sigma Detection of Non-Gaussianity in the WMAP Data Using Hot and Cold Spots
• Non-Gaussianity in WMAP 5-year CMB map seen through Needlets