Speaker
Shi Pi
(ITP)
Description
In single-field inflation, an ultra-slow-roll stage is needed to enhance the curvature perturbation ζ to generate primordial black holes (PBHs) on small scales, which is usually accompanied by large local non-Gaussianity. I will introduce the recent progress on the non-Gaussian curvature perturbation of a logarithmic form. It can naturally give rise to an exponential-tail or a double exponentially suppressed probability density function, which enhances or suppresses the PBH abundance significantly. I will also discuss the phenomenological implications of such non-Gaussianities on the scalar-induced gravitational waves.
