The inflation point in U(1)$_{de}$ hilltop potential assisted by
  chaoton, BICEP2 data, and trans-Planckian decay constant
  The recent BICEP2 report on the CMB B-mode polarization hints an early
Universe energy density at the GUT scale. We add a new 'chaoton' term to our
recently proposed hilltop potential to have a large tensor mode fluctuation.
The chaoton field slides down from the hilltop when the inflaton field value is
small so that an enough e-folding is possible. We also comment how the
trans-Planckian decay constant is obtained from some discrete symmetries of
ultra-violet completed models.
