Non-Gaussianity generated in the inflationary scenario with nonminimally coupled inflaton field

Naonori Sugiyama, Toshifumi Futamase

研究成果: Article査読

8 被引用数 (Scopus)

抄録

We investigate a possibility to restrict various inflationary models with nonminimally coupled inflaton field by future measurement of nonlinear parameter fNL 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()R does not produce large non-Gaussianity, and, in particular, the nonlinear parameter takes a narrow range -0.022<fNL<-0.007 in the case of f()=1+ξ2/mP2 with a wide range of parameter ξ.

本文言語English
論文番号023504
ジャーナルPhysical Review D - Particles, Fields, Gravitation and Cosmology
81
2
DOI
出版ステータスPublished - 2010 1 7

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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