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

Power-law modulation of the scalar power spectrum from a heavy field with a monomial potential