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arXiv · 1105.0073

Large non-Gaussianity in non-minimal inflation

Jinn-Ouk Gong·Hyun Min Lee
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Abstract

We consider a simple inflation model with a complex scalar field coupled to gravity non-minimally. Both the modulus and the angular directions of the complex scalar are slowly rolling, leading to two-field inflation. The modulus direction becomes flat due to the non-minimal coupling, and the angular direction becomes a pseudo-Goldstone boson from a small breaking of the global U(1) symmetry. We show that large non-Gaussianity can be produced during slow-roll inflation under a reasonable assumption on the initial condition of the angular direction. This scenario may be realized in particle physics models such as the Standard Model with two Higgs doublets.

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Jinn-Ouk Gong, Hyun Min Lee. 2011-11-09. Large non-Gaussianity in non-minimal inflation. https://doi.org/10.1088/1475-7516%2F2011%2F11%2F040

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