Large non-Gaussianity in non-minimal inflation

Journal Article · Tue Nov 01 00:00:00 EDT 2011 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2011/11/040· OSTI ID:22279705

Gong, Jinn-Ouk

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.

• OSTI ID: 22279705
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2011, Issue 11; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
COSMOLOGY
COUPLING
GOLDSTONE BOSONS
GRAVITATION
HIGGS BOSONS
HIGGS MODEL
INFLATIONARY UNIVERSE
INFLATONS
SCALAR FIELDS
STANDARD MODEL
U-1 GROUPS