  We study the effect of curvaton decay on the primordial power spectrum. Using
analytical approximations and also numerical calculations, we find that the
power spectrum is enhanced during the radiation dominated era after the
curvaton decay. The amplitude of the Bardeen potential is controlled by the
fraction of the energy density in the curvaton at the time of curvaton decay.
We show that the enhancement in the amplitude of the primordial curvature
perturbation is, however, not large enough to lead to primordial black hole
overproduction on scales which re-enter the horizon after the time of curvaton
decay.
