Large non-Gaussianity in non-minimal inflation

Details Large non-Gaussianity in non-minimal inflation Large non-Gaussianity in non-minimal inflation

2011-04-30

arxiv.org/abs/1105.0073v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

(v1) 14 pages, 2 figures, 1 table; (v2) 15 pages, discussions and references added, to appear in Journal of Cosmology and Astr

Scientific paper

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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