 Scalar spectral index in Hubble slow-roll parameters

ID: scalar-spectral-index-in-hubble-slow-roll-parameters

Differentiating the curvature spectrum at horizon exit gives

n_{s} - 1 = \frac{d l o g Δ _{R}^{2}}{d l o g k} = - 2 ϵ - η

to first order in Hubble slow-roll parameters.

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