We study chaotic and runaway potential inflationary models in the curvaton scenario. In particular, we address the issue of large tensor-to-scalar ratio and red-tilted spectrum in chaotic models and reheating in runaway model in the light of latest Planck results. We show that curvaton can easily circumvent these problems and is well applicable to both type of models. For chaotic models, the observable non-Gaussianity put strong constraints on the decay epoch of curvaton as well as on its field value around the horizon exit. Besides, it can also explain the observed red-tilt in the spectrum as a consequence of its negative mass-squared value. As for the runaway inflationary models, curvaton by sudden decay into the background radiation provides an efficient reheating mechanism, whereas the inflaton rolls down from its potential and enters into the kinetic regime. To this effect, we consider the generalized exponential potential and obtain the allowed parametric space for model parameters. From the estimates on inflaton parameters, we constrained the curvaton mass and then the reheating temperature. We constrained the latter for both dominating and sub-dominating case and show that it agrees with the nucleosynthesis constraint.

中文翻译：

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Curvaton：扰动和再加热

我们研究了曲线情景中的混乱和失控的潜在通货膨胀模型。特别是，我们根据最新的普朗克结果解决了混沌模型中的大张量标量比和红色倾斜光谱以及失控模型中的再加热问题。我们表明，curvaton 可以轻松规避这些问题，并且很好地适用于这两种类型的模型。对于混沌模型，可观察到的非高斯性对曲子的衰变期及其在视界出口附近的场值施加了强烈的约束。此外，它还可以解释由于其负质量平方值导致的光谱中观察到的红色倾斜。至于失控的暴胀模型，通过突然衰减到背景辐射中的曲率提供了一种有效的再加热机制，而暴胀从它的势能滚落并进入动力学状态。为此，我们考虑广义指数势并获得模型参数的允许参数空间。根据对暴胀参数的估计，我们限制了曲率质量，然后限制了再加热温度。我们将后者约束为主导和次主导的情况，并表明它与核合成约束一致。