%0 Journal Article
%T Perturbation Spectra from Intermediate Inflation
%A John D Barrow
%A Andrew R Liddle
%J Physics
%D 1993
%I arXiv
%R 10.1103/PhysRevD.47.R5219
%X We investigate models of `intermediate' inflation, where the scale factor $a(t)$ grows as $a(t) = \exp (A t^f)$, $0 < f < 1$, $A$ constant. These solutions arise as exact analytic solutions for a given class of potentials for the inflaton $\phi$. For a simpler class of potentials falling off as a power of $\phi$ they arise as slow-roll solutions, and in particular they include, for $f = 2/3$, the class of potentials which give the Harrison--Zel'dovich spectrum. The perturbation spectral index $n$ can be greater than unity on astrophysical scales. It is also possible to generate substantial gravitational waves while keeping the scalar spectrum close to scale-invariance; this latter possibility performs well when confronted with most observational data.
%U http://arxiv.org/abs/astro-ph/9303011v1