Unificaxion

Dark matter, gauge coupling unification, and the strong CP problem find a common and simple solution (in the absence of naturalness) within axion models. We show that such a solution, even without specifying the details of the model implementation, makes testable predictions for the experimentally measurable axion parameters: the axion mass anti its coupling to photons. (c) 2012 Elsevier B.V. All rights reserved.