SUPERSYMMETRY BREAKING AND CP VIOLATION IN ORBIFOLD COMPACTIFIED STRING THEORIES

摘要

Compactification of the six unobserved spatial dimensions of string theory onto an orbifold generates loop corrections to the gauge kinetic function in the effective supergavity theory which depend upon the orbifold molduli. The perturbative potential for the moduli is tlat, but the corrections to the gauge kinetic function can generate a non-perturbative superpotential for the hidden sector gaugino condensate, and hence a non-perturbative potential for the mosuli, The minimum of this potential fixes the moduli expectation values, and hence determines the soft supersymmetry-breakng masses, and scalar bilinear (B) and trilinear (A) terms in the perturbative potential. Generically, the moduli have complex expectation values, so the soft supersymmetry-breaking induces CP violation. We discuss the consistency of the predicted CP violation with bounds deriving from experiments searching for an electric dipole moment of the neutron.