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Primordial Fluctuations and Non-Gaussianities in Multifield Dirac-Born-Infeld Inflation

David Langlois 1 S. Renaux-Petel 2 D.A. Steer 1 T. Tanaka
1 APC - THEORIE
APC (UMR_7164) - AstroParticule et Cosmologie, Institut für theoretische Physik
Abstract : 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.
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Submitted on : Thursday, July 10, 2008 - 11:31:54 AM
Last modification on : Wednesday, September 23, 2020 - 4:39:56 AM

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David Langlois, S. Renaux-Petel, D.A. Steer, T. Tanaka. Primordial Fluctuations and Non-Gaussianities in Multifield Dirac-Born-Infeld Inflation. Physical Review Letters, American Physical Society, 2008, 101, pp.061301. ⟨10.1103/PhysRevLett.101.061301⟩. ⟨in2p3-00294691⟩

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