Our beautiful universe : First Cosmological results from the ESA Planck mission
Institut d'Astrophysique de Paris
Tue, Apr. 09th 2013, 11:00
Salle Claude Itzykson, Bât. 774, Orme des Merisiers
After 20 year preparation, a launch in may 2009, 3 years of observation of the cosmic microwave background, 4 years of data reduction, the Planck consortium delivered its first cosmological result to the scientific community 3 weeks ago. The data reveal the picture of an early universe which is remarkably well described by the minimal 6 parameters cosmological model, confirming the observation of late time acceleration of the expansion, the spatial flatness of the universe, the need for some form of cold dark matter and dark energy, and bringing more evidence for a early accelerated expansion phase, often called inflation. The quality of the Planck data also allows to open new fields, bringing a high precision measurement of the simplest form of non gaussianity in the CMB data, and allowing for the reconstruction of the lensing effect on the CMB on the full sky. par In this talk, I briefly will describe the experiment, how and why it was conceived, the challenge of the measurement of the cosmic microwave background to the accuracy reached by Planck, and then describe the main cosmological results, their concordance (and tensions) with the model, and what the Planck legacy will mean to cosmology and astrophysics. par I will conclude by giving a taste of what is to be expected in the coming years, with the next data deliveries from the Planck consortium, which will include the polarization data that is not yet public.