Starobinsky Inflation: From Non-SUSY To SUGRA Realizations
  We review the realization of Starobinsky-type inflation within
induced-gravity Supersymmetric (SUSY) and non-SUSY models. In both cases,
inflation is in agreement with the current data and can be attained for
subplanckian values of the inflaton. The corresponding effective theories
retain perturbative unitarity up to the Planck scale and the inflaton mass is
predicted to be 3x10^13 GeV. The supergravity embedding of these models is
achieved by employing two gauge singlet chiral supefields, a superpotential
that is uniquely determined by a continuous R and a discrete Zn symmetry, and
several (semi)logarithmic Kaehler potentials that respect these symmetries.
Checking various functional forms for the non-inflaton accompanying field in
the Kaehler potentials, we identify four cases which stabilize it without
invoking higher order terms.
