Abstract
We show how supersymmetric grand unified theories provide a natural solution to the strong CP problem. Such theories contain an additional global U(1) PQ chiral (Peccei-Quinn) symmetry which is conserved up to color anomalies. Hence the QCD θ angle is irrelevant. Moreover the PQ symmetry is spontaneously broken at the grand unified scale. As a result standard Weinberg-Wilczek axion has a mass m a ∼ Λ QCD 2 Λ GUM ∼ 10 − 10 e V which effectively decouples from ordinary matter.
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