Abstract
We present a new inflation model in which the inflationary scenario including subsequent reheating is determined in part by a U(1)R×Zn symmetry. A preinflation epoch can be introduced to yield, among other things, a running spectral index indicated by the WMAP analysis. The inflaton decay into right-handed neutrinos, whose masses can be hierarchical because of the Zn symmetry, leads to a reheat temperature ≳108 GeV (∼104–106 GeV in some cases), followed by non-thermal leptogenesis.
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