For the exponential EGB model, the extended slow-roll approximation with V2=6U0(1-δ1)Q gives the same scalar field as the exact equations, while the standard approximation deviates after N≈5.
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Slow-roll approximations in Einstein--Gauss--Bonnet gravity formulated in terms of e-folding numbers
For the exponential EGB model, the extended slow-roll approximation with V2=6U0(1-δ1)Q gives the same scalar field as the exact equations, while the standard approximation deviates after N≈5.