Power-law modulation of the scalar power spectrum from a heavy field
  with a monomial potential
  The effects of heavy fields modulate the scalar power spectrum during
inflation. We analytically calculate the modulations of the scalar power
spectrum from a heavy field with a separable monomial potential, i.e.
V(\phi)~\phi^n. In general the modulation is characterized by a power-law
oscillation which is reduced to the logarithmic oscillation in the case of n=2.
