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

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

2008-02-28

arxiv.org/abs/0802.4138v2

Phys.Rev.D78:023513,2008

Astronomy and Astrophysics

Astrophysics

40 pages, 16 figures, discussions added, references added

Scientific paper

10.1103/PhysRevD.78.023513

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.

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