A Consistency Relation for Power Law Inflation in DBI models
arXiv:hep-th/0703248 · doi:10.1016/j.physletb.2007.05.041
Abstract
Brane inflation in string theory leads to a new realization of power law inflation which can give rise to significant non-gaussianity. This can happen for any throat geometry if the scalar potential is appropriate. This note presents a consistency relation connecting the running of the nonlinearity parameter characterizing the non-gaussianity and the scalar and tensor indices. The relationship is valid assuming that the throat geometry and scalar potential support power law inflation, regardless of the level of non-gaussianity.
Added references, a couple of comments, fixed 3 typos