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2008•Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fieldsOpen access

Spectral index in curvaton scenario

Qing-Guo Huang

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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 paper we find that a red-tilted and large non-Gaussian primordial power spectrum cannot be naturally obtained in the curvaton model, because ${f}_{NL}$ is related to the initial condition of inflation.

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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 paper we find that a red-tilted and large non-Gaussian primordial power spectrum cannot be naturally obtained in the curvaton model, because ${f}_{NL}$ is related to the initial condition of inflation.

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Available 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 paper we find that a red-tilted and large non-Gaussian primordial power spectrum cannot be naturally obtained in the curvaton model, because ${f}_{NL}$ is related to the initial condition of inflation.

Key concepts: CMB cold spot, Non-Gaussianity, Spectral density, Spectral index, Inflation (cosmology), Physics, Astrophysics, Gaussian

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