Inflationary non-Gaussianities in the most general second-order scalar-tensor theories

Antonio De Felice*, Shinji Tsujikawa

*この研究の対応する著者

研究成果: Article査読

135 被引用数 (Scopus)

抄録

For very general scalar-field theories in which the equations of motion are at second order, we evaluate the three-point correlation function of primordial scalar perturbations generated during inflation. We show that the shape of non-Gaussianities is well approximated by the equilateral type. The equilateral nonlinear parameter fNLequil is derived on the quasi-de Sitter background, where the slow-variation parameters are much smaller than unity. We apply our formula for fNLequil to a number of single-field models of inflation-such as k-inflation, k-inflation with Galileon terms, potential-driven Galileon inflation, nonminimal coupling models (including field-derivative coupling models), and Gauss-Bonnet gravity.

本文言語English
論文番号083504
ジャーナルPhysical Review D - Particles, Fields, Gravitation and Cosmology
84
8
DOI
出版ステータスPublished - 2011 10月 7
外部発表はい

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学
  • 物理学および天文学(その他)

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