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The Curvature Perturbation in the Axion-type Curvaton Model · Around

2009

The Curvature Perturbation in the Axion-type Curvaton Model

Chingangbam, Pravabati, Huang, Qing-Guo

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We study the axion-type curvaton model, with emphasis on the large field regime where analytic results are very difficult to obtain.

We evaluate the tensor-scalar ratio $r$ using WMAP normalization and the non-linearity parameters $f_{NL}$ and $g_{NL}$ by solving the equations numerically using the $\delta N$ formalism.
We compare them with results for the curvaton with quadratic potential.
We find that $r$ is much smaller for the axion-type case compared to the result from the quadratic potential, with the difference increasingly more pronounced at larger field values.

Built on

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K. Dimopoulos, D. H. Lyth, A. Notari and A. Riotto, “The curvaton as a Pseudo-Nambu-Goldstone boson,” JHEP 0307
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Q. G. Huang, “The N-vaton,” JCAP 0809
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Then

K. Enqvist and T. Takahashi, “Signatures of Non-Gaussianity in the Curvaton Model,” JCAP 0809
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Later among the works it cites.
Q. G. Huang and Y. Wang, “Curvaton Dynamics and the Non-Linearity Parameters in Curvaton Model,” JCAP 0809
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Q. G. Huang, “Curvaton with Polynomial Potential,” JCAP 0811
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D. Langlois, F. Vernizzi and D. Wands, “Non-linear isocurvature perturbations and non-Gaussianities,” JCAP 0812
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T. Suyama and M. Yamaguchi, “Non-Gaussianity in the modulated reheating scenario,” Phys. Rev. D 77
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