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

By Qing-Guo Huang


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.Comment: 15 pages, 3 figures; refs and clarifications added, version accepted for publication in JCA

Topics: Astrophysics - Cosmology and Nongalactic Astrophysics, General Relativity and Quantum Cosmology, High Energy Physics - Phenomenology, High Energy Physics - Theory
Year: 2011
DOI identifier: 10.1088/1475-7516/2011/04/010
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