Spectral Index in Curvaton Scenario

Abstract

A red tilted primordial power spectrum is preferred by WMAP five-year data and a large positive local-type non-Gaussianity $f_{NL}$ might be observed as well. In this short note we find that a red tilted and large non-Gaussian primordial power spectrum cannot be naturally obtained in curvaton model, because $f_{NL}$ is related to the initial condition of inflation.

12 pages; refs added

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• String Cosmology: A Review
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Cited by in corpus (1)

• N-vaton