Speaker
Alessio Notari
Description
I will explore the possibility that theories with unstable
Domain Walls in the Early Universe could be responsible for the generation of a
Gravitational Wave background signal, focusing in particular on the recent signal
detected by Pulsar Timing Arrays experiments, NANOGrav 12.5 years dataset and
International PTA Data Release 2 (IPTA DR2). As an example, a QCD Axion much
heavier than usual might generate such a signal.
