Strongly scale-dependent polyspectra from curvaton self-interactions
  We study the scale dependence of the non-linearity parameters f_NL and g_NL
in curvaton models with self-interactions. We show that the spectral indices
n_fNL=d ln|f_NL|/(d ln k) and n_gNL=d ln |g_NL|/(d ln k) can take values much
greater than the slow--roll parameters and the spectral index of the power
spectrum. This means that the scale--dependence of the bi and trispectrum could
be easily observable in this scenario with Planck, which would lead to tight
additional constraints on the model. Inspite of the highly non-trivial
behaviour of f_NL and g_NL in the curvaton models with self-interactions, we
find that the model can be falsified if g_NL(k) is also observed.
