Non-gaussianities for primordial black hole formation

Understand

We analyze primordial non-gaussianities in presence of an ultra-slow phase during the inflationary dynamics, focusing on scenarios relevant for the production of primordial black holes.

• We compute the three-point correlation function of comoving curvature perturbations finding that non-gaussianities are sizable, and predominantly local.
• In the context of threshold statistics, we analyze their impact for the abundance of primordial black holes, and their interplay with the non-gaussianities arising from the non-linear relation between density and curvature perturbations.
• We find that non-gaussianities significantly modify the estimate of the primordial black holes abundance obtained with the gaussian approximation.