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The absence of supersymmetric particles at the weak scale is a puzzle ifsupersymmetry solves the gauge hierarchy problem. We show that, if theright-handed neutrino masses arise from hidden gaugino condensation viaGUT-suppressed operators, successful thermal leptogenesis leads to the lowerbound on the gravitino mass, which may explain the little hierarchy problem. Ifdomain walls associated with the gaugino condensation are formed afterinflation, they annihilate when $H \sim m_{3/2}$. We address the possibilitythat observable gravitational wave signals might emerge from the domain wallannihilation.

Heavy Gravitino from Dynamical Generation of Right-Handed Neutrino Mass Scale, and Gravitational Waves