APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker: Michele Oliosi (Yukawa Institute for Theoretical Physics, Kyoto University)
Title: Constant-roll and primordial black holes
Date: Tue, Apr 07, 2020, 15:30 - 16:30
Place: Zoom Seminar
Related File: 2527.pdf
Abstract: I will discuss the possibility that a period of constant-roll inflation could produce primordial black holes (PBH), via an increase of the primordial power spectrum. Indeed, constant-roll can accommodate different values for the tilt of the scalar power spectrum, in particular a blue tilt, which would help reaching the PBH formation threshold. As a concrete realization, we have constructed a model with a stage of constant-roll placed between two slow-roll stages, and have shown that it could generate PBH at different scales, while satisfying observational constraints--in particular CMB ones.