Abstract
We study observational implications of thestochastic gravitational wave backgroundand a non-Gaussian feature of scalar perturbations on the curvatonmechanism of the generation of density/curvature fluctuations,and show that they can determine the properties of the curvatonin a complementary manner to each other. Therefore even if Planckcould not detect any non-Gaussianity, future space-based laserinterferometers such as DECIGO or BBO could practically exhaustits parameter space.
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