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In this paper, we have studied the spectrum of curvature perturbation ofmulti-field inflation with general small-field potential. We assume that theisocurvature perturbation may be neglected, and by using the Sasaki-Stewartformalism, we found that the spectrum may be redder or bluer than of itscorresponding single field. The result depends upon the values of fields andtheir effective masses at the horizon-crossing time. We discuss the relevantcases.

Spectrum of Curvature Perturbation of Multi-field Inflation with Small-Field Potential