At the end of inflation the Universe is frozen in a near zero-entropy state with energy density in a coherent scalar field and must be ``defrosted'' to produce the observed entropy and baryon number. We propose that the baryon asymmetry is generated by the decay of supermassive grand-unified-theory (GUT) bosons produced nonthermally in a preheating phase after inflation. We show that baryogenesis is possible for an inflaton mass of order 10¹³GeV and a GUT Higgs boson mass of order 10¹⁴GeV, thus solving many drawbacks facing GUT baryogenesis in the old reheating scenario.
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Kolb et al. (1996) studied this question.
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