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Proceedings Paper

Tools to detect non-Gaussianity in nonstandard cosmological models
Author(s): Julio E. Gallegos; Enrique Martinez-Gonzalez; Francisco Argueso; Laura Cayon; Jose Luis Sanz
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Paper Abstract

We present a method to detect non-Gaussianity in CMB temperature fluctuations maps, based on the spherical Mexican Hat wavelet. We have applied this method to artificially generated non-Gaussian maps using the Edgeworth expansion. Analysing the skewness and kurtosis of the wavelet coefficients in contrast to Gaussian simulations, the Mexican Hat is more efficient in detecting non-Gaussianity than the spherical Haar wavelet for all different leves of non-Gaussianity introduced. These results are relevant to test the Gaussian character of the CMB data. The method has also been applied to non-Gaussian maps generated by introducing an additional quadratic term in the gravitational potential.

Paper Details

Date Published: 19 December 2002
PDF: 12 pages
Proc. SPIE 4847, Astronomical Data Analysis II, (19 December 2002); doi: 10.1117/12.461124
Show Author Affiliations
Julio E. Gallegos, Instituto de Fisica de Cantabria (Spain)
Enrique Martinez-Gonzalez, Instituto de Fisica de Cantabria (Spain)
Francisco Argueso, Univ. de Oviedo (Spain)
Laura Cayon, Instituto de Fisica de Cantabria (Spain)
Jose Luis Sanz, Instituto de Fisica de Cantabria (Spain)

Published in SPIE Proceedings Vol. 4847:
Astronomical Data Analysis II
Jean-Luc Starck; Fionn D. Murtagh, Editor(s)

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