Speaker
Description
At the interface between quantum gravity and cosmology, evaporating ultra-light primordial black holes (PBHs) provide a novel probe of Hawking radiation through distinctive stochastic gravitational-wave (GW) signatures. This talk will first review how induced GWs are generated via the so-called poltergeist mechanism and how these signals can probe small-scale primordial non-Gaussianity. The main focus will then be on the universal suppression of induced GWs for non-monochromatic PBH mass distributions, arising from the continuous depletion of the surviving PBH population during evaporation. The resulting high-frequency GW spectrum encodes the underlying evaporation dynamics, largely independently of the details of the initial mass function.