Sparse Analysis of Multichannel and Spherical Astronomical Data

Statistics and Modeling for Complex Data

The satellite PLANCK, launched in 2009, maps the anisotropies in the cosmic microwave background (CMB), this being radiation emitted 13.7 billion years ago, at the time when the Universe became transparent to light.  The goal of the experiment is to measure with a precision better than 1%, the parameters for the Standard Model of cosmology, also known as the "Big Bang model."  
PLANCK provides us full sky temperature and polarized maps in nine frequencies, from 27 to 850 GHz. We present sparse representations on the sphere and show and these decompositions can be used for recovering the CMB.