Hadronic decays of cosmological gravitinos

Physics

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Scientific paper

We discuss a variety of effects due to the thermalisation and possible annihilation of relativistic protons and antiprotons from the decay of cosmological gravitinos. For a rather narrow range of gravitino mass around 250 GeV, the photons produced by inverse ``Compton'' scattering of nucleons off the thermal radiation are of the right energy to photodissociate helium 4, creating deuterium and helium 3. In a supersymmetric inflationary universe, this leads to a maximum reheating temperature of about 1.2 × 107 GeV for this particular gravitino mass.
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