Séminaire / Seminar GReCO |
| « Adventures in the CMB damping tail: La fièvre neutrino et comment je me suis soigné » |
|
L. Knox |
| There are a number of different lines of evidence pointing toward extra species of neutrinos, including somewhat less power in the CMB power spectrum at high resolution. I will mention these various lines of evidence and then present the recent inference of the CMB power spectrum from the South Pole Telescope (SPT) data. I will provide a physical explanation for the constraints on cosmological parameters that we can derive from the combined SPT and WMAP data, including the constraint on the number of neutrino species. Then, regrettably, I will explain why overall I see the case for extra neutrino species as far from compelling. The standard six-parameter cosmological model remains frustratingly successful. I will speculate about what we may learn from the measurement of the damping tail by Panck. |
|
jeudi 7 juillet 2011 - 11:00 Salle des séminaires Évry Schatzman Institut d'Astrophysique de Paris |
| Pages web du séminaire / Seminar's webpage |