Cosmologically benign gravitinos at the weak scale

Physics

Scientific paper

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Scientific paper

We show that a gravitino with mass O(mw) and a high reheat temperature after inflation, TR≅1012-1014GeV, c an be compatible with cosmological constraints if the gravitino decays predominantly into neutrino-sneutrino pairs. Models in which the lightest supersymmetric particle is either the sneutrino or the neutralino are described. In this scenario, gravitino decay provides an alternative mechanism for producing supersymmetric dark matter, which may be either hot or cold.

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