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The recent BICEP2 report on the CMB B-mode polarization hints an earlyUniverse energy density at the GUT scale. We add a new 'chaoton' term to ourrecently proposed hilltop potential to have a large tensor mode fluctuation.The chaoton field slides down from the hilltop when the inflaton field value issmall so that an enough e-folding is possible. We also comment how thetrans-Planckian decay constant is obtained from some discrete symmetries ofultra-violet completed models.

The inflation point in U(1)$_{de}$ hilltop potential assisted by chaoton, BICEP2 data, and trans-Planckian decay constant