Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-07-19
Nucl.Phys. B454 (1995) 357-368
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, Constraints on axion decays from limits on photodissociation of light elements revised. No change in final results.
Scientific paper
10.1016/0550-3213(95)00410-T
We consider the cosmological and astrophysical constraints on the decay of massive $E_8 \times E_8^\prime$ 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 $\Lambda>1.2\times10^{13}\gev$, where $\Lambda$ 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 $5\times 10^{13}\gev$ for $\L$ obtained independently by setting supersymmetric scalar masses equal to $m_W$.
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