Spectral index and running of $g_{NL}$ from an isocurvature scalar field

Details Spectral index and running of $g_{NL}$ from an isocurvature scalar field Spectral index and running of $g_{NL}$ from an isocurvature scalar field

2011-02-23

arxiv.org/abs/1102.4686v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

15 pages, 3 figures; refs and clarifications added, version accepted for publication in JCAP

Scientific paper

It is possible that the primordial non-Gaussianity is dominated by the higher order terms, such as that set by $g_{NL}$, not $f_{NL}$. In this paper we derive the spectral index and running of $g_{NL}$ from a single isocurvature scalar field. The scale dependences of non-Gaussianity parameters are detectable if the mass of isocurvature field is not too small compared to the Hubble parameter during inflation. In addition, we also apply our results to investigate the curvaton model with near quadratic potential in detail.

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