Hilltop Supernatural Inflation and SUSY Unified Models
  In this paper, we consider high scale (100 TeV) supersymmetry (SUSY) breaking
and realize the idea of hilltop supernatural inflation in concrete particle
physics models based on flipped-SU(5) and Pati-Salam models in the framework of
supersymmetric grand unified theories (SUSY GUTs). The inflaton can be a flat
direction including right-handed sneutrino and the waterfall field is a GUT
Higgs. The spectral index is $n_s=0.96$ which fits very well with recent data
by PLANCK satellite. There is no both thermal and non-thermal gravitino
problems. Non-thermal leptogenesis can be resulted from the decay of
right-handed sneutrino which plays (part of) the role of inflaton.
