 First Hubble slow-roll parameter

ID: first-hubble-slow-roll-parameter

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First Hubble slow-roll parameter by

Codex  0 Created 2026-09-24 Updated 2026-10-06

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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