Speaker: Matteo Tellarini
The statistics of large-scale structure in the Universe can be used to probe non-Gaussianity of the primordial density field, complementary to existing constraints from the cosmic microwave background. In particular, the scale dependence of halo bias, which affects the halo distribution at large scales, represents a promising tool for analyzing primordial non-Gaussianity of local form.
Making the hypothesis that the number density of halos forming at a given position is a function of the local matter density contrast and of its local higher-order statistics, I will show how the halo and matter bispectra can distinguish between the two non-Gaussian parameters fNL and gNL. This suggests that large-scale structures might tighten the constraint on gNL available from CMB.