Sketched out in 1992, selected by ESA in 1996, launched in 2009, Planck delivered a first set of results on March 21, 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 370 000 years. Since 2013, we analyzed twice more data and in particular the polarization information we gathered over the full course of the mission. I will describe the new results we just obtained, and in particular confront what temperature and polarization anisotropies teach us, both in terms of content of the universe and of characteristics of the primordial fluctuations.
Held Tuesdays at 4:15 pm, in the William R. Hewlett Teaching Center, room 200 (see map). Refreshments in the lobby of Varian Physics at 4:00 pm.
Autumn 2014/15, Committee: A. Linde (Chair), L. Hollberg, B. Macintosh & Young Lee