Non-Gaussianity, Spectral Index and Tensor Modes in Mixed Inflaton and Curvaton Models

By K. Ichikawa, T. Suyama, Tomo Takahashi, Masahide Yamaguchi. 2008

178 citations recorded by the source corpus.

We study non-Gaussianity, the spectral index of primordial scalar fluctuations, and tensor modes in models where fluctuations from the inflaton and the curvaton can both contribute to the present cosmic density fluctuations. Even though simple single-field inflation models generate only tiny non-Gaussianity, if we consider such a mixed scenario, large non-Gaussianity can be produced. Furthermore, we study the inflationary parameters such as the spectral index and the tensor-to-scalar ratio in this kind of models and discuss in what cases models predict the spectral index and tensor modes allowed by the current data while generating large non-Gaussianity, which may have many implications for model-buildings of the inflationary universe.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/45bad1978afe9b330116c3e82af71368cf9a7412

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In Astronomy and Astrophysics

1. D. Langlois
2. F. Vernizzi
3. D. Wands
4. Tsutomu Kobayashi
5. K. Koyama
6. K. Noui
7. Louis Pèrenon
8. N. Frusciante

Citations in the corpus

• Non-linear isocurvature perturbations and non-Gaussianities (2008, methodology): “Indeed, the 3-point function of ζr yields (see also [32] for a similar analysis) 〈ζr(~k1)ζr(~k2)ζr(~k3)〉 = (2π)(3)δ(Σi~ki)b NL [Pζr(k1)Pζr(k2) + perms] , (31) where Pζr(k) = 2π (2)Pζr(k)/k(3) and b NL is a non-linear parameter given in this case by b NL = 1 r ( 3 2 − 2r − r2 )”