Speaker
Prof.
Ulf Meißner
(University of Bonn)
Description
In this talk, I will explore consequences of the QCD θ-term in our Universe as well as in the Multiverse. First, I discuss the bounds set by element generation in the Big Bang on the value of θ. Then, I present precision results on various couplings of the axion to matter and also discuss a recent proposal of enhanced axiproduction via the ∆(1232) resonance.