Hilltop Curvatons
arXiv:0712.2103 · doi:10.1016/j.physletb.2007.12.008
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 corrections, where is the Hubble parameter. We assume that the effective mass of a curvaton is expressed as , where the coefficient varies within 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