Primordial Non-Gaussianities from Inflation Models

Figure 6

Behavior of the slow-roll parameters for a step (solid line, 𝑐=0.0018, 𝑑=0.022𝑀_P) and bump (dashed line, 𝑐=0.0005, 𝑑=0.01𝑀_P) sharp feature on (1/2)𝑚²𝜙² potential. Note that in the absence of the sharp feature, 𝜖𝜂^′ is of order 𝒪(10⁻⁴).