Speaker
Antonio Junior Iovino
Description
The recent data releases by multiple pulsar timing array (PTA) experiments show
evidence for Hellings-Downs angular correlations indicating that the observed
stochastic common spectrum can be interpreted as a stochastic gravitational wave
background. We study whether the signal may originate from gravitational waves
induced by high-amplitude primordial curvature perturbations. Such large
perturbations may be accompanied by the generation of a sizeable primordial black
hole (PBH) abundance. We discuss in which scenarios the inclusion of
non-Gaussianities in the computation of the abundance can lead to a signal
compatible with the PTA experiments without overproducing PBHs.
Primary author
Antonio Junior Iovino
