Running Non-Gaussianities in DBI Inflation
arXiv:astro-ph/0507053 · doi:10.1103/PhysRevD.72.123518
Abstract
We study the non-Gaussianity in the simplest infrared (IR) model of the DBI inflation. We show that the non-Gaussianity in such a model is compatible with the current observational bound, and is within the sensitivity of future experiments. We also discuss the scale dependence of the non-Gaussianity. In the DBI inflation, such a feature can be used as a probe to the properties of the background geometry of the extra dimensions or internal space.
17 pages; v3, a numerical correction in f_NL, references added, PRD version