Shapes of primordial non-Gaussianities in the Horndeski's most general 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

47 被引用数 (Scopus)

抄録

In the Horndeski's most general scalar-tensor theories, we derive the three-point correlation function of scalar non-Gaussianities generated during single-field inflation in the presence of slow-variation corrections to the leading-order term. Unlike previous works, the resulting bispectrum is valid for any shape of non-Gaussianities. In the squeezed limit, for example, this gives rise to the same consistency relation as that derived by Maldacena in standard single-field slow-roll inflation. We estimate the shape close to the squeezed one at which the effect of the term inversely proportional to the scalar propagation speed squared begins to contribute to the bispectrum. We also show that the leading-order bispectrum can be expressed by the linear combination of two convenient bases whose shapes are highly correlated with equilateral and orthogonal types respectively. We present concrete models in which the orthogonal and enfolded shapes can dominate over the equilateral one.

本文言語English
論文番号030
ジャーナルJournal of Cosmology and Astroparticle Physics
2013
3
DOI
出版ステータスPublished - 2013 3月
外部発表はい

ASJC Scopus subject areas

  • 天文学と天体物理学

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