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We study CMB constraints on non-Gaussianity from isocurvature perturbationsof general types. Specifically, we study CDM/neutrino isocurvatureperturbations which are uncorrelated or totally correlated with adiabatic ones.Using the data from the WMAP 7-year observation at V and W bands, we obtainedoptimal constraints on the nonlinearity parameters of adiabatic andisocurvature perturbations. Our result shows that primordial perturbations areconsistent with Gaussian ones at around 2 sigma level for above mentionedisocurvature modes.

Extended analysis of CMB constraints on non-Gaussianity in isocurvature perturbations