Joint INFN-UNIMI-UNIMIB Pheno Seminars

The landscape of QCD axion models

by Luca Di Luzio (DESY Hamburg)

Aula Caldirola (Dipartimento di Fisica, Università degli Studi di Milano)

Aula Caldirola

Dipartimento di Fisica, Università degli Studi di Milano

Via Giovanni Celoria, 16, 20133 Milano MI, Italia

Four decades after its prediction the axion remains the most compelling solution to the strong CP problem and a well motivated dark matter candidate, inspiring several ultrasensitive experiments based on axion-photon mixing. After reviewing the axion solution of the strong CP problem and the experimental landscape of axion searches, I will focus on some recent developments in axion model building which show that the QCD axion parameter space is much larger than what traditionally thought. The implications for astrophysical limits and future experiments will be discussed as well.