Modulated decay in the multi-component Universe
  The early Universe after inflation may have oscillations, kinations
(nonoscillatory evolution of a field), topological defects, relativistic and
non-relativistic particles at the same time. The Universe whose energy density
is a sum of those components can be called the multi-component Universe. The
components, which may have distinguishable density scalings, may decay
modulated. In this paper we study generation of the curvature perturbations
caused by the modulated decay in the multi-component Universe.
