出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：One of the goals in cosmology is to understand the formation and evolution of the structures
resulting from the growth of initial density perturbations. Recent Cosmic Microwave Background
(CMB) observations indicate that the latter essentially came out of Gaussian distributed quantum
fluctuations in the inflationary scenario. However, topological defects (e.g. cosmic strings) could
contribute to the signal. One of their important footprint would be the predicted non-Gaussian
distribution of the temperature anisotropies. In addition, other sources of non-Gaussian signatures
do contribute to the signal, in particular the Sunyaev-Zel’dovich effect of galaxy clusters[01].
In this general context and motivated by the PLANCK experiment, we address the question of
finding and discriminating between the different non-Gaussian signatures using both wavelet and
curvelet transforms on the sphere to analyse simulated data.
