Dynamical Tuning of the Initial Condition for New Inflation in Supergravity

We point out that for a class of new inflation' models in supergravity the required initial value of the inflaton field is dynamically set if there is another inflation (pre-inflation’) before the new inflation'. We study the dynamics of both inflatons by taking a hybrid inflation model for the pre-inflation’ as an example. We find out that our new inflation' model provides reheating temperatures T_R \simeq 10 MeV - 10^4 GeV low enough to avoid the gravitino problem even in gauge-mediated supersymmetry-breaking models. We also construct a model where the scale for the new inflation’ is generated by nonperturbative dynamics of a supersymmetric gauge theory.