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Non-Gaussian Fingerprints of Self-Interacting Curvaton · Around

2009

Non-Gaussian Fingerprints of Self-Interacting Curvaton

Enqvist, Kari, Nurmi, Sami, Taanila, Olli et al.

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We investigate non-Gaussianities in self-interacting curvaton models treating both renormalizable and non-renormalizable polynomial interactions.

We scan the parameter space systematically and compute numerically the non-linearity parameters f_NL and g_NL.
We find that even in the interaction dominated regime there are large regions consistent with current observable bounds.
Whenever the interactions dominate, we discover significant deviations from the relations f_NL ~ 1/r_decay and g_NL ~ 1/r_decay valid for quadratic curvaton potentials, where r_decay measures the curvaton contribution to the total energy density at the time of its decay.

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