Abstract
Late decaying ( τ > 10 4 s) particles can alter the standard big bang predictions for the light-element abundances. If M > 10 GeV, light-element production and 4He destruction can take place when hadronic decay products interact with the ambient protons and 4He causing hadronic showers; pepletion is the result of photodissociation by energetic decay protons. Previous works [1–4] which put limits in the properties of these particles ignored hadronic showers entirely, and usually considered only selected photodissociation reactions. We consider the full set of reactions and present both analytic and numerical bounds on the properties of particles with lifetimes greater than 10 4 s. This drastically alters the limits on particle masses, lifetimes and abundances. For a gravitino lighter than a TeV, the reheat temperature must be less than 10 10 GeV.
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