Correlation of isocurvature perturbation and non-Gaussianity

摘要: We explore the correlations between primordial non-Gaussianity and isocurvature perturbation. sketch generic relation bispectrum of curvature perturbation cross-correlation power spectrum in presence explicit couplings inflaton another light field which gives rise to Using a concrete model Peccei-Quinn type with gravitational couplings, we illustrate explicitly how correlates spectrum. Assuming resulting fnl ~ O(1), find that form correlation depends mostly upon inflation but only weakly on axion parameters, even though itself does depend heavily parameters.