Search for Non-Gaussianities in the WMAP Data with the Scaling Index Method

被引：6

作者：

Rossmanith, G. ^{[1
]}

Modest, H. ^{[1
]}

Raeth, C. ^{[1
]}

Banday, A. J. ^{[2
,3
,4
]}

Gorski, K. M. ^{[5
,6
]}

Morfill, G. ^{[1
]}

机构：

[1] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany

[2] Univ Toulouse, UPS OMP, IRAP, F-31058 Toulouse, France

[3] Ctr Etud Spatiale Rayonnements, F-31028 Toulouse, France

[4] Max Planck Inst Astrophys, D-85741 Garching, Germany

[5] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[6] Univ Warsaw Observ, PL-00478 Warsaw, Poland

来源：

ADVANCES IN ASTRONOMY | 2011年 / 2011卷

关键词：

PRIMORDIAL NON-GAUSSIANITY; MINKOWSKI FUNCTIONALS; INFLATIONARY UNIVERSE; POWER ASYMMETRY; COLD SPOT; 3-YR DATA; FULL SKY; MICROWAVE; ANOMALIES; MAPS;

D O I：

10.1155/2011/174873

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 theWMAP 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.

引用

页数：21

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