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Physical Review Letters 101 (2008) 061301
Primordial Fluctuations and Non-Gaussianities in Multifield Dirac-Born-Infeld Inflation
D. Langlois1, S. Renaux-Petel1, D.A. Steer1, 2, T. Tanaka
(08/2008)

We study Dirac-Born-Infeld (DBI) inflation models with multiple scalar fields. We show that the adiabatic and entropy modes propagate with a common effective sound speed and are thus amplified at the sound horizon crossing. In the small sound speed limit, we find that the amplitude of the entropy modes is much higher than that of the adiabatic modes. 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 DBI case.
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
2 :  CERN - European Organization for Nuclear Research
APC - THEORIE
Physique/Physique des Hautes Energies - Théorie
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/0804.3139