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- W2962862022 abstract "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." @default.
- W2962862022 created "2019-07-30" @default.
- W2962862022 creator A5056314318 @default.
- W2962862022 date "2015-11-01" @default.
- W2962862022 modified "2023-09-27" @default.
- W2962862022 title "Angular spectra for non-Gaussian isotropic fields" @default.
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- W2962862022 doi "https://doi.org/10.1214/14-bjps249" @default.
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