The Cosmic Microwave Background (CMB) is a picture of the very first
moment of our Universe and, in the context of the present and future CMB
experiments, it has become necessary to go behind the first order
analysis of its power spectrum. The non-Gaussian signatures in the CMB
represent a very promising tool to probe the early universe and the
structure formation epoch. We first present schematically what is the
CMB and what kind of signatures we expect are produced at the beginning
of the Universe and during its evolution. We present the various
multiscale analysis (Bi-orthogonal Wavelet Transform, "A trous"
Wavelets, ridgelets and Curvelets) we have performed on simulations of
the processes that led to the expected cosmological signal in terms of
detection of the non-Gaussian signatures and discuss the relative
sensitivity of the different methods.
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