New features in curvaton model

Understand

We demonstrate novel features in the behavior of the second and third order non-linearity parameters of the curvature perturbation, namely, $f_{NL}$ and $g_{NL}$, arising from non-linear motion of curvaton field.

• We investigate two classes of potentials for the curvaton - the first has tiny oscillations super-imposed upon the quadratic potential.
• The second is characterized by a single 'feature' separating two quadratic regimes with different mass scales.
• The feature may either be a bump or a flattening of the potential.