Heavy gravitino in hybrid inflation
  It is known that supersymmetric hybrid inflation model may require severe
tunings on the initial condition for large gravitino mass of order 100 - 1000
TeV due to the constant term in the superpotential. We propose a modified
hybrid inflation model, where the constant term is suppressed during inflation
and generated after inflation by replacing a constant term with dynamical
field. In this modified model, successful inflation consistent with large
gravitino mass takes place without severe tunings on the initial condition.
Constraint from cosmic strings is also relaxed.
