Séminaire / Seminar GReCO |
| « Primordial fluctuations and non-Gaussianities in multi-field DBI inflation » |
|
S. Renaux Petel |
| I shall present a recent work in which we study Dirac-Born-Infeld (DBI) inflation with multiple scalar fields. We show that adiabatic and entropy modes propagate with a common effective sound speed. In the small sound speed limit, we find that the amplitude of the entropy modes is much higher than that of the adiabatic mode. We show that this could strongly affect the observable curvature power spectrum as well as the amplitude of non-Gaussianities, although their shape remains as in the single-field case. |
|
lundi 19 mai 2008 - 11:00 Salle des séminaires Évry Schatzman Institut d'Astrophysique de Paris |
| Pages web du séminaire / Seminar's webpage |