Multifield DBI Inflation and Non-Gaussianities

Details Multifield DBI Inflation and Non-Gaussianities Multifield DBI Inflation and Non-Gaussianities

2007-09-20

arxiv.org/abs/0709.3299v3

Phys.Rev.D77:023511,2008

Physics

High Energy Physics

High Energy Physics - Theory

7 pages, 4 figures; v2. references added; v3. typos corrected, matches published version

Scientific paper

10.1103/PhysRevD.77.023511

We analyze the trajectories for multifield DBI 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 DBI 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.

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