PROFESSOR FRANÇOIS R. BOUCHET

Sketched out in 1992, selected by ESA in 1996, launched in 2009, Planck delivered a first set of results in 21 March 2013, in particular a "definitive" map of the anisotropies of the Cosmic Microwave Background (CMB). The later displays minuscule variations as a function of the observing direction of the temperature of the fossil radiation around its mean temperature of 2.725K. These CMB anisotropies, of rms ~100microK, reveal the imprint of the primordial fluctuations which initiate the growth of the large scale structures of the Universe, as transformed by their evolution, in particular during the first 3,70,000 years. Since 2013, we analysed twice more data and in particular the polarisation information we gathered over the full course of the mission. The speaker will describe the new results that were obtained recently, and in particular confront what temperature and polarisation anisotropies teach us, both in terms of content of the universe and of characteristics of the primordial fluctuations which emerged from quantum fluctuations of the vacuum, before the creation of light and matter.