158 articles – 1995 Notices  [english version]
 HAL : in2p3-00294691, version 1
 arXiv : 0804.3139
 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.
 équipe(s) de recherche : APC - THEORIE
 Thème(s) : Physique/Physique des Hautes Energies - Théorie
 Lien vers le texte intégral : http://fr.arXiv.org/abs/0804.3139
 in2p3-00294691, version 1 http://hal.in2p3.fr/in2p3-00294691 oai:hal.in2p3.fr:in2p3-00294691 Contributeur : Simone Lantz <> Soumis le : Jeudi 10 Juillet 2008, 11:31:54 Dernière modification le : Dimanche 7 Octobre 2012, 12:29:41