Large non-Gaussianity in non-minimal inflation

Jinn Ouk Gong, Hyun Min Lee

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

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.

Original languageEnglish
Article number040
JournalJournal of Cosmology and Astroparticle Physics
Volume2011
Issue number11
DOIs
StatePublished - Nov 2011

Keywords

  • cosmological perturbation theory
  • cosmology of theories beyond the SM
  • inflation
  • non-gaussianity

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