Moduli mediation without moduli-induced gravitino problem

Understand

We study the moduli-induced gravitino problem within the framework of the phenomenologically attractive mirage mediations.

• The huge amount of gravitino generated by the moduli decay can be successfully diluted by introducing an extra light modulus field which does not induce the supersymmetry breaking.
• Since the lifetime of extra modulus field becomes longer than usually considered modulus field, our proposed mechanism is applied to both the low- and high-scale supersymmetry breaking scenarios.
• We also point out that such an extra modulus field appears in the flux compactification of type II string theory.