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Title

Conditions for large non-Gaussianity in two-field slow-roll inflation

AuthorsByrnes, Christian T.; Choi, Ki-Young ; Hall, Lisa M. H.
KeywordsAstrophysics
General Relativity and Quantum Cosmology
High Energy Physics - Theory
Issue Date7-Jul-2008
CitationarXiv:0807.1101v1 [astro-ph]
SeriesIFT-UAM/CSIC-08-42
FTUAM 08/8
HD-THEP-08-16
AbstractWe study the level of primordial non-Gaussianity in slow-roll two-field inflation. Using an analytic formula for the nonlinear parameter f_NL in the case of a sum or product separable potential, we find that it is possible to generate significant non-Gaussianity even during slow-roll inflation with Gaussian perturbations at Hubble exit. In this paper we give the general conditions to obtain large non-Gaussianity and calculate the level of fine-tuning required to obtain this. We present explicit models in which the non-Gaussianity at the end of inflation can exceed the current observational bound of |f_NL|<100.
Description16 pages, 6 figures, 1 table.-- PACS number: 98.80.Cq.
URIhttp://hdl.handle.net/10261/6842
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