Suppressed Non-Gaussianity in the Curvaton Model
  We show that the local type non-Gaussianity in a class of curvaton models is
suppressed, i.e. the non-linearity parameters f_{NL} and those related with
higher order statistics can be at most O(1), even if the curvaton energy
density is subdominant at the decay. This situation is naturally realized in a
very simple curvaton potential with quadratic term plus quartic term.
