Grand unification scale CP violating phases and the electric dipole moment -: art. no. 115003

The question of CP violating phases in supersymmetry and electric dipole moments (EDMs) is considered within the framework of supergravity grand unification (GUT) models with a light (less than or similar to 1 TeV) mass spectrum. In the minimal model, the nearness of the t-quark Landau pole automatically suppresses the t-quark cubic soft breaking phase at the electroweak scale. However, current EDM data require the quadratic soft breaking phase to be small at the electroweak scale unless tan beta is small (tan beta less than or similar to 3), and the EDM data combined with the requirement of electroweak symmetry breaking require this phase to be both large and highly fine-tuned at the GUT scale unless tan beta is small. Nonminimal models are also examined and generally show the same behavior.