Strongly scale-dependent polyspectra from curvaton self-interactions

Details Strongly scale-dependent polyspectra from curvaton self-interactions Strongly scale-dependent polyspectra from curvaton self-interactions

2011-08-12

arxiv.org/abs/1108.2708v2

JCAP 1111 (2011) 011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

19 pages, many figures. v2: Figure 4 replaced with a corrected normalisation, conclusions unchanged. Matches version published

Scientific paper

10.1088/1475-7516/2011/11/011

We study the scale dependence of the non-linearity parameters f_NL and g_NL in curvaton models with self-interactions. We show that the spectral indices n_fNL=d ln|f_NL|/(d ln k) and n_gNL=d ln |g_NL|/(d ln k) can take values much greater than the slow--roll parameters and the spectral index of the power spectrum. This means that the scale--dependence of the bi and trispectrum could be easily observable in this scenario with Planck, which would lead to tight additional constraints on the model. Inspite of the highly non-trivial behaviour of f_NL and g_NL in the curvaton models with self-interactions, we find that the model can be falsified if g_NL(k) is also observed.

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