Séminaire / Seminar GReCO |
| « A non inflationary cosmological paradigm » |
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P. Peter |
| Inflation is a paradigm that currently lacks challengers in solving the many problems (horizon, flatness, ...) encountered in standard cosmology. And it can even produce perturbations in agreement with data. A scale invariant spectrum is produced during a matter dominated contraction, so it is natural to ask whether such a phase could bounce to the currently expanding epoch, and what would the consequences be. I shall show that such a bouncing paradigm not only solves the usual problems, actually dynamically leading to a homogeneous model, but that it also predicts a spectrum of perturbations which exhibits differences with the inflation predictions (oscillations and tensor to scalar ratio). Forthcoming Planck data might single out one paradigm over the other! |
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Monday 01 December 2008 - 11:00 Salle des séminaires Évry Schatzman Institut d'Astrophysique de Paris |
| Pages web du séminaire / Seminar's webpage |