Brazilian Journal of Probability and Statistics

Angular spectra for non-Gaussian isotropic fields

György Terdik

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Cosmic microwave background (CMB) Anisotropies is a subject of intensive research in recent years, and therefore it is necessary to develop suitable theory and methods for the analysis of isotropic fields on spheres. The main object of our paper is to show that the polyspectra can be given as the coefficients of the orthogonal expansion of cumulants of the field in terms of irreducible tensor products of spherical harmonics. We obtain necessary and sufficient conditions for isotropy of a non-Gaussian field and the conditions are stated in terms of higher order spectra (polyspectra). The relation between cumulants and spectra gives a new method of estimating spectra.

Article information

Braz. J. Probab. Stat., Volume 29, Number 4 (2015), 833-865.

Received: December 2013
Accepted: May 2014
First available in Project Euclid: 17 September 2015

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Bispectrum trispectrum angular polyspectra CMB non-Gaussianity spherical random fields isotropy


Terdik, György. Angular spectra for non-Gaussian isotropic fields. Braz. J. Probab. Stat. 29 (2015), no. 4, 833--865. doi:10.1214/14-BJPS249.

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