Hilltop Curvatons

Abstract

We study ``hilltop'' curvatons that evolve on a convex potential. Hilltop curvatons evolving on the Hubble-induced potential are generic if supergravity is assumed in the theory. We do not consider curvatons whose potential is protected from $O(H)$ corrections, where $H$ is the Hubble parameter. We assume that the effective mass of a curvaton is expressed as $m_{\sigma }=cH$, where the coefficient varies within $0.2\le c\le 5$ depending on the circumstances. A negative mass term may lead to enhancement of curvaton fluctuation, which has a significant impact on the energy bound for low-scale inflation. Using a simple curvaton model and following the conventional curvaton hypothesis, we demonstrate the generality of this enhancement.

15 pages, added references

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• Evolution of the curvature perturbations during warm inflation
• Non-Gaussianity in the inflating curvaton
• Spotted Inflation
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• Running spectral index from shooting-star moduli
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• Cosmological constraints on the curvaton web parameters
• Non-standard kinetic term as a natural source of non-Gaussianity
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• Right-Handed Sneutrino Curvaton and non-Gaussianity
• Towards an analytic solution of rapid roll inflation with a quartic potential
• Unified Origin of Curvature Perturbation and Baryon Asymmetry of the Universe