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Potential slow-roll parameter

The potential slow-roll parameter is

ϵ_{V} = \frac{M _{Pl}^{2}}{2} (\frac{V ^{'}}{V})^{2} .

Under the slow-roll equations,

\dot{ϕ}^{2} / (2 V) ≃ ϵ_{V} /3

.

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