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Inflation with a constant rate of roll · Around

2014

Inflation with a constant rate of roll

Motohashi, Hayato, Starobinsky, Alexei A., Yokoyama, Jun'ichi

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We consider an inflationary scenario where the rate of inflaton roll defined by $\ddot\phi/H\dot \phi$ remains constant.

The rate of roll is small for slow-roll inflation, while a generic rate of roll leads to the interesting case of `constant-roll' inflation.
We find a general exact solution for the inflaton potential required for such inflaton behaviour.
In this model, due to non-slow evolution of background, the would-be decaying mode of linear scalar (curvature) perturbations may not be neglected.

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