Discovery of Large Scale Tensor Mode and Chaotic Inflation in
  Supergravity
  The BICEP2 collaboration has recently reported a large tensor fluctuation in
the cosmic microwave background, which suggests chaotic inflation models. In
this letter, we reconsider the chaotic inflation model in the supergravity. We
introduce a non-holomorphic shift-symmetry breaking parameter, which we expect
to exist in general, and discuss its effect on the inflaton dynamics. We show
that the model predicts a sizable deviation from the original chaotic inflation
model and the predicted tensor fluctuation can lie between the BICEP2 result
and the upper bound given by the Planck experiment with a small shift-symmetry
breaking parameter. The model is characterized by only two parameters, which
yields predictability and testability in future experiments.
