Abstract
We consider the cosmological and astrophysical constraints on the decay of massive E 8 × E 8′ superstring axions associated with the hidden sector. We find that decay lifetimes greater than 1 s are ruled out by limits from nucleosynthesis, by limits on the distortion of the cosmic microwave and gamma ray backgrounds and by closure arguments. We conclude that Λ > 1.2 × 10 13 GeV, where Λ is the scale of gaugino condensation in the hidden sector. This implies that the scale of supersymmetry breaking is greater than 10 10 GeV. Significantly, our result agrees with the value of 5 x 10 13 GeV for Λ obtained independently by setting supersymmetric scalar masses equal to m w .
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