Polynomial Chaotic Inflation in Supergravity Revisited
  We revisit a polynomial chaotic inflation model in supergravity which we
proposed soon after the Planck first data release. Recently some issues have
been raised in Ref.[12], concerning the validity of our polynomial chaotic
inflation model. We study the inflaton dynamics in detail, and confirm that the
inflaton potential is very well approximated by a polynomial potential for the
parameters of our interest in any practical sense, and in particular, the
spectral index and the tensor-to-scalar ratio can be estimated by single-field
approximation. This justifies our analysis of the polynomial chaotic inflation
in supergravity.
