The Strong CP Problem: Detecting the QCD Axion with Supernovae

I will explore one of the most profound open question in particle physics, focusing on some exciting directions of my ongoing research activity: the strong CP problem. I will begin with an overview of the strong CP problem, highlighting proposed solutions based on parity and time-reversal symmetries and their rich phenomenology, which can be probed at present and future collider experiments. I will then turn to the axion solution, including my recent proposal for a network of gamma-ray satellites, whose construction started earlier this year, that could enable axion detection in the event of a galactic supernova.