The subdominant curvaton

doi:10.1088/1475-7516/2009/11/003

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Journal of Cosmology and Astroparticle Physics

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Journal of Cosmology and Astroparticle Physics Volume 2009 November 2009 Create an alert RSS this journal

Kari Enqvist et al JCAP11(2009)003 doi:10.1088/1475-7516/2009/11/003

The subdominant curvaton

Kari Enqvist^a,b, Sami Nurmi^c, Gerasimos Rigopoulos^b, Olli Taanila^a,b and Tomo Takahashi^d

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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. Field dynamics turns out to be highly non-trivial, and for non-renormalizable potentials and certain regions of the parameter space we observe a non-monotonous relation between the final curvature perturbation and the initial curvaton value. In those cases, the time evolution of the primordial perturbation also displays an oscillatory behaviour before the curvaton decay.

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