Tachyon Mediated Non-Gaussianity

Details Tachyon Mediated Non-Gaussianity Tachyon Mediated Non-Gaussianity

2008-05-09

arxiv.org/abs/0805.1229v3

Phys.Rev.D78:083522,2008

Physics

High Energy Physics

High Energy Physics - Theory

6 pages; v3 discussion about loops included, shape of the intrinsic contribution corrected, references added

Scientific paper

10.1103/PhysRevD.78.083522

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.

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