Speakers
Alessio Notari
(Istituto Nazionale di Fisica Nucleare)
Alessio Notari
(Universitat de Barcelona)
Description
A population of thermally produced QCD axions from the early universe is expected to exist, in addition to a cold dark matter population. I discuss axion production from scattering with pions, including momentum dependence. I will show that to exploit the reach of current and upcoming cosmological surveys, non-perturbative calculations around and above the QCD crossover are needed. I will also review production from other Standard Model particles (quarks, leptons).