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Published online by Cambridge University Press: 04 August 2017
Axions are a natural consequence of the only known solution of the ‘Strong CP Problem.’ The axion represents a minimal U(1) extension to the standard SU(3) × SU(2) × U(1) model of the strong and electroweak interactions and furthermore appears very frequently in the contexts of SUSY GUTs, Kaluza-Klein, Superstring, Technicolor, and other unified models. As such, the axion is perhaps the best motivated conjectured particle.