Large non-Gaussianity from two-component hybrid inflation

Byrnes C, Choi K-Y, Hall LMH (2009)
JCAP 2009(02).

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We study the generation of non-Gaussianity in models of hybrid inflation withtwo inflaton fields, (2-brid inflation). We analyse the region in the parameterand the initial condition space where a large non-Gaussianity may be generatedduring 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 satisfytau_NL>>f_NL^2. The bispectrum is of the local type but may have a significantscale dependence. We show that the loop corrections to the power spectrum andbispectrum are suppressed during inflation, if one assume that the fieldsfollow a classical background trajectory. We also include the effect of thewaterfall field, which can lead to a significant change in the observablesafter the waterfall field is destabilised, depending on the couplings betweenthe waterfall and inflaton fields.
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Byrnes C, Choi K-Y, Hall LMH. Large non-Gaussianity from two-component hybrid inflation. JCAP. 2009;2009(02).
Byrnes, C., Choi, K. - Y., & Hall, L. M. H. (2009). Large non-Gaussianity from two-component hybrid inflation. JCAP, 2009(02).
Byrnes, C., Choi, K. - Y., and Hall, L. M. H. (2009). Large non-Gaussianity from two-component hybrid inflation. JCAP 2009.
Byrnes, C., Choi, K.-Y., & Hall, L.M.H., 2009. Large non-Gaussianity from two-component hybrid inflation. JCAP, 2009(02).
C. Byrnes, K.-Y. Choi, and L.M.H. Hall, “Large non-Gaussianity from two-component hybrid inflation”, JCAP, vol. 2009, 2009.
Byrnes, C., Choi, K.-Y., Hall, L.M.H.: Large non-Gaussianity from two-component hybrid inflation. JCAP. 2009, (2009).
Byrnes, Christian, Choi, Ki-Young, and Hall, Lisa M. H. “Large non-Gaussianity from two-component hybrid inflation”. JCAP 2009.02 (2009).
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