Search for Non-Gaussianities in the WMAP Data with the Scaling Index Method
In the recent years, non-Gaussianity and statistical isotropy of the Cosmic Microwave Background (CMB) was investigated with various statistical measures, first and foremost by means of the measurements of the WMAP satellite. In this paper, we focus on the analyses that were accomplished with a meas...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Hindawi Limited
2011-01-01
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| Series: | Advances in Astronomy |
| Online Access: | http://dx.doi.org/10.1155/2011/174873 |
| Summary: | In the recent years, non-Gaussianity and statistical isotropy of the Cosmic Microwave Background
(CMB) was investigated with various statistical measures, first and foremost by means of the measurements
of the WMAP satellite. In this paper, we focus on the analyses that were accomplished
with a measure of local type, the so-called Scaling Index Method (SIM). The SIM is able to detect
structural characteristics of a given data set and has proven to be highly valuable in CMB analysis.
It was used for comparing the data set with simulations as well as surrogates, which are full-sky maps generated by randomisation of previously selected features of the original map. During
these investigations, strong evidence for non-Gaussianities as well as asymmetries and local features
could be detected. In combination with the surrogates approach, the SIM detected the highest
significances for non-Gaussianity to date. |
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| ISSN: | 1687-7969 1687-7977 |