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

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.

preprint2011arXivOpen access
Qing-Guo Huang
astro-ph.COhep-phgr-qchep-th
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Qing-Guo Huang

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