Tachyon mediated non-Gaussianity Academic Article uri icon

abstract

  • We describe a general scenario where primordial non-Gaussian curvature perturbations are generated in models with extra scalar fields. The extra scalars communicate to the inflaton sector mainly through the tachyonic (waterfall) field condensing at the end of hybrid inflation. These models can yield significant non-Gaussianity of the local shape, and both signs of the bispectrum can be obtained. These models have cosmic strings and a nearly flat power spectrum, which together have been recently shown to be a good fit to WMAP data. We illustrate with a model of inflation inspired from intersecting brane models. 2008 The American Physical Society.

published proceedings

  • Physical Review D

author list (cited authors)

  • Dutta, B., Leblond, L., & Kumar, J.

citation count

  • 16

complete list of authors

  • Dutta, Bhaskar||Leblond, Louis||Kumar, Jason

publication date

  • October 2008