Deriving Hubble slow-roll parameters from an analytic approximate Hubble parameter in Starobinsky inflation provides better accuracy than the potential slow-roll approximation, reducing the inferred e-foldings by more than one for ns=0.9649.
Rodrigues-da Silva, J
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Improving Slow-Roll Estimates in Starobinsky Inflation Using Analytic Hubble Parameter
Deriving Hubble slow-roll parameters from an analytic approximate Hubble parameter in Starobinsky inflation provides better accuracy than the potential slow-roll approximation, reducing the inferred e-foldings by more than one for ns=0.9649.