QCD, Strong CP and Axions

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.

arXiv comment13 Latex pages + 1 postscript figure

Cited by in corpus (7)

• Scale Symmetry Breaking From Total Derivative Densities and the Cosmological Constant Problem
• A Composite Axion from a Supersymmetric Product Group
• CP Violation and Flavor Mixing in Technicolor Theories
• ALP-portal majorana dark matter
• Solar axions in large extra dimensions
• Non-perturbative Treatments of the Bosonic String and the Axion with Cosmological Implications
• Axion mechanism of Sun luminosity, dark matter and extragalactic background light