“…In fact, upon perturbing the metric then the (αδg)-term would give higher order terms, whereas the α(∂ β χ∂ β χ) 2 would give, in the slow-roll inflationary era, contributions of order α χ4 which is subdominant compared to the α-correction in U . Thus, in [1], one could apply the shortcut "potential method", using U as an effective potential. We intend now to refine this analysis, and consider the effect of the quadratic kinetic energy, keeping first order in α when α is small, and studying, in addition, the case where α is large.…”