A KSVZ-like model with a fermion dark matter candidate produced by UV freeze-in through the axion portal is shown to have viable parameter space at TeV mass and axion decay constant near 10^10 to 10^11 GeV.
QCD, Strong CP and Axions
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abstract
The physical origin of the strong CP problem in QCD, rooted in the structures of the vacuum of the standard model, is reviewed. The chiral solution to this problem, with its accompanying axion, is explained and various characteristics of axions are detailed. Although visible axion models are excluded experimentally, models with very light and very weakly coupled axions are still tenable. The astrophysical and cosmological implications of such axion models are discussed, along with ongoing experimental attempts to detect such, so called, invisible axions.
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Dark matter from axion and small neutrino mass
A KSVZ-like model with a fermion dark matter candidate produced by UV freeze-in through the axion portal is shown to have viable parameter space at TeV mass and axion decay constant near 10^10 to 10^11 GeV.