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2008

Signatures of Non-Gaussianity in the Curvaton Model

Enqvist, Kari, Takahashi, Tomo

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We discuss the signatures of non-Gaussianity in the curvaton model where the potential includes also a non-quadratic term.

In such a case the non-linearity parameter f_NL can become very small, and we show that non-Gaussianity is then encoded in the non-reducible non-linearity parameter g_NL of the trispectrum, which can be very large.
Thus the place to look for the non-Gaussianity in the curvaton model may be the trispectrum rather than the bispectrum.
We also show that g_NL measures directly the deviation of the curvaton potential from the purely quadratic form.

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Then

K. Enqvist and S. Nurmi, JCAP 0510
2005
Later among the works it cites.
D. H. Lyth, K. A. Malik and M. Sasaki, JCAP 0505
Original
2005
Later among the works it cites.
K. A. Malik and D. H. Lyth, JCAP 0609
2006
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M. Sasaki, J. Valiviita and D. Wands, Phys. Rev. D 74
2006
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