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We consider a supersymmetric model of inflation in which the primordial density fluctuations are nearly scale invariant (spectral index n0. 98) with an amplitude proportional to (M/M₋₀₍₂₊) ^2, where M10^16 GeV denotes the scale of the gauge symmetry breaking associated with inflation. The 60 or so e foldings take place when all relevant scales are close to M, which helps suppress supergravity corrections. The gravitino and baryogenesis (via leptogenesis) constraints help determine the two heaviest right-handed neutrino masses to be 210^13 GeV and 610^9 GeV.
Lazarides et al. (Tue,) studied this question.
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