Speaker
Antonio Junior Iovino
(Istituto Nazionale di Fisica Nucleare)
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
(Istituto Nazionale di Fisica Nucleare)
Co-authors
Gabriele Franciolini
(Istituto Nazionale di Fisica Nucleare)
Dr
Hardi Veermae
(KBFI, Tallinn)
Ville Antero Vaskonen
(Istituto Nazionale di Fisica Nucleare)
