Leptogenesis in Smooth Hybrid Inflation
Abstract
We present a concrete supersymmetric grand unified model based on the Pati-Salam gauge group SU(4)c x SU(2)L x SU(2)R and leading naturally to smooth hybrid inflation, which avoids the cosmological disaster encountered in the standard hybrid inflationary scenario from the overproduction of monopoles at the end of inflation. Successful `reheating' which satisfies the gravitino constraint takes place after the termination of inflation. Also, adequate baryogenesis via a primordial leptogenesis occurs consistently with the solar and atmospheric neutrino oscillation data as well as the SU(4)c symmetry.
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