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05 November 2024
 
  » arxiv » astro-ph/9303011

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Perturbation Spectra from Intermediate Inflation
John D Barrow ; Andrew R Liddle ;
Date 23 Mar 1993
Journal Phys.Rev. D47 (1993) 5219-5223
Subject astro-ph
AbstractWe 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.
Source arXiv, astro-ph/9303011
Other source [GID 320050] pmid10015591
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