Multifield DBI Inflation and Non-Gaussianities
High Energy Physics - Theory
2008-11-26 v3 Astrophysics
General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
Abstract
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.
Keywords
Cite
@article{arxiv.0709.3299,
title = {Multifield DBI Inflation and Non-Gaussianities},
author = {Min-xin Huang and Gary Shiu and Bret Underwood},
journal= {arXiv preprint arXiv:0709.3299},
year = {2008}
}
Comments
7 pages, 4 figures; v2. references added; v3. typos corrected, matches published version