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Abstract: We describe a general scenario where primordial non-Gaussian curvatureperturbations are generated in models with extra scalar fields. The extrascalars communicate to the inflaton sector mainly through the tachyonicwaterfall field condensing at the end of hybrid inflation. These models canyield significant non-Gaussianity of the local shape, and both signs of thebispectrum can be obtained. These models have cosmic strings and a nearly flatpower spectrum, which together have been recently shown to be a good fit toWMAP data. We illustrate with a model of inflation inspired from intersectingbrane models.



Autor: Bhaskar Dutta, Jason Kumar, Louis Leblond

Fuente: https://arxiv.org/







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