Research | Collaborazioni Scientifiche | Seminari e Convegni

Primordial black holes (PBHs) are intriguing astrophysical objects that could shed light on the early universe and offer insights into cosmology and gravitational physics. This presentation provides an overview of PBHs, focusing on their abundance and the associated scalar-induced gravitational waves (SIGWs), which are detectable through pulsar timing arrays (PTAs). A key topic will be the methodologies and uncertainties in calculating PBH abundance and SIGWs, highlighting recent advancements and open challenges. Lastly, we propose some evidence of a correspondence between the formation of BHs, specifically in the radiation phase of the early universe and the properties of the null geodesics around the perturbation which eventually collapse into the BH final state.