Seminars

Phenomenology of the QCD axion

by Giovanni Villadoro

Wednesday, 19 July 2017 from to (Europe/Rome)
at 281
Description
The QCD axion is probably the most robust solution to the strong CP problem and a natural dark matter candidate. While its properties, such as the mass and the couplings, are mostly determined by non-perturbative QCD effects I will present recent computations demonstrating that they can be reliably extracted with percent accuracy, which is important for the theory interpretation of experimental results. I will also discuss some recent 
lattice QCD results highlighting a departure from the usual instanton 
estimates and potentially changing the prediction for the axion relic 
abundance substantially.