2011/05/31 by Jinn-Ouk Gong, Hyun Min Lee · 21 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Boson #Classical mechanics #Cosmic microwave background #Cosmology and Gravitation Theories #Extra dimensions #Geometry #Goldstone boson #Higgs boson #Inflation (cosmology) #Non-Gaussianity #Particle physics #Physics #Quantum mechanics #Scalar (mathematics) #Scalar field #Symmetry breaking #Theoretical physics #astro-ph.CO #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1088/1475-7516/2011/11/040
published in Journal of Cosmology and Astroparticle Physics 2011(11), 040 (Institute of Physics) · (v1) 14 pages, 2 figures, 1 table; (v2) 15 pages, discussions and references added, to appear in Journal of Cosmology and Astroparticle Physics
arxiv created 2011/11/09 · openalex publication_date 2011/11/22 · arxiv updated 2015/05/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.