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VOLUME 55 (1992) | ISSUE 9 | PAGE 477
Spectrum of adiabatic perturbations in the universe when there are singularities in the inflaton potential
If the potential of the effective scalar which controls the de Sitter (inflationary) stage in the early universe has a singularity consisting of a rounded change in slope, a step of a universal form arises in the spectrum of adiabatic perturbations. Along with this step, there are superimposed modulations. If the singularity in the potential is instead a rounded jump, a hump appears in the spectrum.