CP VIOLATION BY SOFT SUPERSYMMETRY BREAKING TERMS IN ORBIFOLD COMPACTIFICATIONS

The possibility of spontaneous breaking of CP symmetry by the expectat ion values of orbifold moduli is investigated with particular referenc e to CP violating phases in soft supersymmetry breaking terms. The eff ect of different mechanisms for stabilizing the dilaton and the form o f the non-perturbative superpotential on the existence and size of the se phases is studied. Non-perturbative superpotentials involving the a bsolute modular invariant j(T), such as may arise from F-theory compac tifications, are considered. (C) 1997 Elsevier Science B.V.