Large non-Gaussianity from two-component hybrid inflation

Details Large non-Gaussianity from two-component hybrid inflation Large non-Gaussianity from two-component hybrid inflation

2008-12-04

arxiv.org/abs/0812.0807v2

JCAP 0902:017,2009

Astronomy and Astrophysics

Astrophysics

16 pages, 6 figures; v2: comments and references added, typos corrected, matches published version

Scientific paper

10.1088/1475-7516/2009/02/017

We study the generation of non-Gaussianity in models of hybrid inflation with two inflaton fields, (2-brid inflation). We analyse the region in the parameter and the initial condition space where a large non-Gaussianity may be generated during slow-roll inflation which is generally characterised by a large f_NL, tau_NL and a small g_NL. For certain parameter values we can satisfy tau_NL>>f_NL^2. The bispectrum is of the local type but may have a significant scale dependence. We show that the loop corrections to the power spectrum and bispectrum are suppressed during inflation, if one assume that the fields follow a classical background trajectory. We also include the effect of the waterfall field, which can lead to a significant change in the observables after the waterfall field is destabilised, depending on the couplings between the waterfall and inflaton fields.

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