Non-Gaussianity generated in the inflationary scenario with nonminimally coupled inflaton field
- Astronomical Institute, Graduate School of Science, Tohoku University, Sendai 980-77 (Japan)
We investigate a possibility to restrict various inflationary models with nonminimally coupled inflaton field {phi} by future measurement of nonlinear parameter f{sub NL} which characterizes the non-Gaussianity in the cosmic microwave background temperature fluctuation. These models are related to the minimally coupled inflationary models by conformal transformation. We show that the curvature perturbation is invariant under the conformal transformation up to the second order. By using this property we show that nonminimal coupling f({phi})R does not produce large non-Gaussianity, and, in particular, the nonlinear parameter takes a narrow range -0.022<f{sub NL}<-0.007 in the case of f({phi})=1+{xi}{phi}{sup 2}/m{sub P}{sup 2} with a wide range of parameter {xi}.
- OSTI ID:
- 21409037
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 81, Issue 2; Other Information: DOI: 10.1103/PhysRevD.81.023504; (c) 2010 The American Physical Society; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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