High-resolution asymptotics for the angular bispectrum of spherical random fields

Details High-resolution asymptotics for the angular bispectrum of spherical random fields High-resolution asymptotics for the angular bispectrum of spherical random fields

2005-02-21

arxiv.org/abs/math/0502434v2

Annals Statist.34:1-41,2006

Mathematics

Probability

Published at http://dx.doi.org/10.1214/009053605000000903 in the Annals of Statistics (http://www.imstat.org/aos/) by the Inst

Scientific paper

10.1214/009053605000000903

In this paper we study the asymptotic behavior of the angular bispectrum of spherical random fields. Here, the asymptotic theory is developed in the framework of fixed-radius fields, which are observed with increasing resolution as the sample size grows. The results we present are then exploited in a set of procedures aimed at testing non-Gaussianity; for these statistics, we are able to show convergence to functionals of standard Brownian motion under the null hypothesis. Analytic results are also presented on the behavior of the tests in the presence of a broad class of non-Gaussian alternatives. The issue of testing for non-Gaussianity on spherical random fields has recently gained enormous empirical importance, especially in connection with the statistical analysis of cosmic microwave background radiation.

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