Multifield Dirac-Born-Infeld inflation and non-Gaussianities

2007/09/30 by Min-xin Huang, Gary Shiu, Bret Underwood · 8 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #astro-ph #gr-qc #hep-ph #hep-th

paper · pdf · doi:10.1103/physrevd.77.023511

published as Phys.Rev.D77:023511,2008 · 7 pages, 4 figures; v2. references added; v3. typos corrected, matches published version

arxiv created 2008/01/15 · openalex publication_date 2008/01/15 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We analyze the trajectories for multifield Dirac-Born-Infeld inflation, which can arise in brane inflation models, and show that the trajectories are the same as in typical slow roll inflation. We calculate the power spectrum and find that the higher derivative terms of the Dirac-Born-Infeld action lead to a suppression of the contribution from the isocurvature perturbations. We also calculate the bispectrum generated by the isocurvature perturbation, and find that it leads to distinctive features.

Citations

• A General Analytic Formula for the Spectral Index of the Density Perturbations produced during Inflation
• IR inflation from multiple branes
• k-Inflation

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• On the four-dimensional effective theories in brane-worlds
• Large primordial trispectra in general single field inflation