Mathematics – Probability
Scientific paper
2008-07-04
Journal of Multivariate Analysis, Vol. 101 (2010), pp.77-100
Mathematics
Probability
29 pages
Scientific paper
We characterize the angular polyspectra, of arbitrary order, associated with isotropic fields defined on the sphere S^2. Our techniques rely heavily on group representation theory, and specifically on the properties of Wigner matrices and Clebsch-Gordan coefficients. The findings of the present paper constitute a basis upon which one can build formal procedures for the statistical analysis and the probabilistic modelization of the Cosmic Microwave Background radiation, which is currently a crucial topic of investigation in cosmology. We also outline an application to random data compression and "simulation" of Clebsch-Gordan coefficients.
Marinucci Domenico
Peccati Giovanni
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