Gravitational Wave Background and Non-Gaussianity as a Probe of the
  Curvaton Scenario
  We study observational implications of the stochastic gravitational wave
background and a non-Gaussian feature of scalar perturbations on the curvaton
mechanism of the generation of density/curvature fluctuations, and show that
they can determine the properties of the curvaton in a complementary manner to
each other. Therefore even if Planck could not detect any non-Gaussianity,
future space-based laser interferometers such as DECIGO or BBO could
practically exhaust its parameter space.
