Primordial bispectrum and trispectrum in multifield Dirac-Born-Infeld inflation

Abstract

We explain the motivation and main idea of our work in reference arXiv:0907.2476 [hep-th]. We present a simple model of multifield Dirac-Born-Infeld inflation whose bispectrum exhibits a linear combination of the equilateral and local shapes, which are usually considered as separate possibilities. We also point out the presence of a particularly interesting component of the primordial trispectrum.

3 pages, 1 figure; to appear in the Proceedings of the 12th Marcel Grossman Meeting, 13--18 July 2009, Paris, France.