First cosmological results from the Planck satellite
Envie de télécharger cette vidéo sur votre ordinateur ? Cliquez ici (poids : 0 Mo)
Résumé
Sketched out in 1992, selected by ESA in 1996, launched in 2009, Planck will have delivered on March 21st its first full sky maps of the millimetric emission at 9 frequencies, as well as those which follow from them, and in particular Planck 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 fossile radiation around its mean temperature of 2.725K. I will briefly describe how these high resolution maps with a precision of a few parts in a million have been obtained, from collection to analysis of the first 500 billion samples of our HFI instrument. CMB anisotropies 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, i.e. till the Universe became transparent and the forming of the image we record today. The statistical characteristics of these anisotropies allow constraining jointly the physics of the creation of the primordial fluctuations and that of their evolution. They teach us the possible value of the parameters of the models which we confront to data. I will describe Planck estimates of the density of the constituents of the Universe (usual matter, cold dark matter or CDM, dark energy...), and their implication in terms of derived quantities like the expansion rate or the spatial curvature. I will review what we learnt on the generation of the fluctuation, and wil discuss extensions of the standard cosmological model, so called "Lambda-CDM", both in term of non minimal physical models --- multi-field inflation for instance, or additional constituents - like cosmic strings or a fourth neutrino. Finally, I will briefly describe other promising results on the matter distribution which is travelled through by the CMB image on its long 13.7 billion years trip towards us. I will mention in particular what we can learn on the dark matter distribution - which is detected through its distorting effet of the CMB image by gravitationnal lensing, or that of hot gaz, which is revealed by the spectral distortion it induces.
Note(s) Biographique(s)
Bibliographie
Orateur(s) : François Bouchet, Directeur de recherches, Institut d'Astrophysique de Paris, CNRS & UMPC, Responsable Scientifique de Planck/HFI
Public : Tous
Date : 14 mai 2013
Lieu : Campus Jussieu

- Le mécanisme de Brout-Englert-Higgs et son boson scalaire
- Higgs boson: the challenges of a very special discovery
- Universal Superfluidity in Ultracold Atomic Gases
- First cosmological results from the Planck satellite
- Le photon d’Einstein et l’atome de Bohr revisités par l’électrodynamique quantique en cavité
- Time reversal symmetry in optics
- Poincaré et le problème de la forme de l’espace
- Active processes in cells and tissues Liste détaillée.
Vidéos disponibles
- Le site de colloquium
- Colloquium 2012
- Colloquium 2011
En savoir plus
Flash Player
Si vous rencontrez des problèmes pour visualiser la vidéo, nous vous recommandons de mettre à jour Flash Player