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2009

The Subdominant Curvaton

Enqvist, Kari, Nurmi, Sami, Rigopoulos, Gerasimos et al.

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We present a systematic study of the amplitude of the primordial perturbation in curvaton models with self-interactions, treating both renormalizable and non-renormalizable interactions.

In particular, we consider the possibility that the curvaton energy density is subdominant at the time of the curvaton decay.
We find that large regions in the parameter space give rise to the observed amplitude of primordial perturbation even for non-renormalizable curvaton potentials, for which the curvaton energy density dilutes fast.
At the time of its decay, the curvaton energy density may typically be subdominant by a relative factor of 10^-3 and still produce the observed perturbation.

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K. Enqvist, S. Nurmi, G. I. Rigopoulos, O. Taanila and T. Takahashi, in preparation

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