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The Taylor expansion method has been used to investigate the scale dependenceof the power spectrum of the curvature perturbation. In the present study, analternative numerical method is used to clarify the $k$ dependence. Althoughthere is thought to be no large difference between these two methods, somedifferences arise among various inflation models. For example, at $k$ = 1 Mpc,there is a 1.4 % difference in the power spectrum, and with respect to theangular power spectrum, the difference of the value of $\chi^2$ nearly 10 occurin new inflation. However, in hybrid inflation, these differences do not occur.The time dependence of the inflationary and cosmological parameters isinvestigated, and differences among inflation models are clarified.

Scale dependence of the power spectrum of the curvature perturbation determined using a numerical method in slow-roll inflation