| Popis: |
We discuss features of the inflaton potential that can lead to a strong enhancement of the power spectrum of curvature perturbations. We show that a steep steplike feature induces an enhancement of the spectrum by several orders of magnitude within a certain range of scales. It also produces a distinctive oscillatory pattern. We study the origin of the oscillations and the additive effect of several steps. We analyze a simplified potential, with an ad hoc introduction of steps at certain field values, but also discuss the possible application to supergravity models. |
