Transport equations for the inflationary spectral index

Abstract

We present a simple and efficient method to compute the superhorizon evolution of the spectral index in multi-field inflationary models, using transport equation techniques. We illustrate the evolution of n_s with time for various interesting potentials.

6 pages; minor changes to match published version

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• Observable predictions of generalised inflationary scenarios
• Non-linear effects in early Universe cosmology
• Slow-roll corrections in multi-field inflation: a separate universes approach
• Aspects of inflation and the very early universe
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• Non-Gaussianity in D3-brane inflation
• Moment transport equations and their application to the perturbed universe