First Hubble slow-roll parameter ( $ϵ$ )

The first Hubble slow-roll parameter is

ϵ = - \frac{H ˙}{H ^{2}} .

For a canonical inflaton,

ϵ = \dot{ϕ}^{2} / (2 M_{Pl}^{2} H^{2}) \geq 0

.

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Past exam of the mathematics course of the University of Cambridge / 2003 / iii / Paper 55 / 4 / Solution
Past exam of the mathematics course of the University of Cambridge / 2006 / iii / Paper 62 / 2 / c / Solution
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Power-law inflation

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