Gravitino-induced baryogenesis: A problem made a virtue

We investigate cosmic baryon generation in the minimal low-energy supergravity model with the addition of dimension-four baryon-violating interactions. It is shown that gravitinos, if heavier than squarks, can give rise to a baryon asymmetry as they decay. Assuming that gravitinos are not diluted by inflation in the post-Planckian epoch, we find a realistic baryon-to-photon ratio for various ranges of gaugino and squark masses between 100 GeV and 10 TeV. We thus solve two problems simultaneously--the question of whence baryons originate and how to avoid washing out the baryon-photon ratio due to entropy production from decaying gravitinos