Speaker
David Stefanyszyn
(University of Nottingham)
Description
I will discuss parity violation in the early universe. I’ll outline a no-go theorem that states that vanilla inflation cannot produce parity-violating inflationary correlators, then show how including additional massive states in the early universe can yield non-zero signals that take an intriguing factorised form. For example, the parity odd four-point function of scalar perturbations can be written in terms of bispectra and power spectra. Such a correlator-to-correlator factorisation formula holds for general kinematics and is in principle a testable relation that can be used to determine some fundamental properties about inflation.
