Comprehensive analysis of the simplest curvaton model
Comprehensive analysis of the simplest curvaton model
复制标题
DOI：
10.1103/physrevd.90.023523
复制
发表时间：
2014-03
影响因子：
5
通讯作者：
C. Byrnes;Marina Cortês;A. Liddle
中科院分区：
文献类型：
--
作者：
C. Byrnes;Marina Cortês;A. Liddle
我们对基于两个非相互作用质量场的最简单曲率模型进行了全面的分析。我们的分析包括膨胀和曲率都对可观测的扰动有贡献的情况，以及曲率本身驱动第二阶段的膨胀的情况。我们同时考虑了功率谱和非高斯观测值，并重点考虑了模型参数空间中的约束条件。完全由曲率主导的状态与观测数据有些矛盾，而暴胀产生的扰动的混合改善了拟合。膨胀的曲率机制模拟了对通货膨胀的预测。功率谱数据允许的部分参数空间被非高斯性约束排除。最近的BICEP2结果[1]要求，在总扰动中，非暴胀扰动提供了很大的一部分，排除了通常的曲率情况，在这种情况下暴胀扰动可以忽略不计，尽管不是暴胀和曲率都对光谱有贡献的混合情况。
We carry out a comprehensive analysis of the simplest curvaton model, which is based on two non-interacting massive fields. Our analysis encompasses cases where the inflaton and curvaton both contribute to observable perturbations, and where the curvaton itself drives a second period of in inflation. We consider both power spectrum and non-Gaussianity observables, and focus on presenting constraints in model parameter space. The fully curvaton-dominated regime is in some tension with observational data, while an admixture of inflaton-generated perturbations improves the fit. The inflating curvaton regime mimics the predictions of Nflation. Some parts of parameter space permitted by power spectrum data are excluded by non-Gaussianity constraints. The recent BICEP2 results [1] require that the in inflaton perturbations provide a significant fraction of the total perturbation, ruling out the usual curvaton scenario in which the inflaton perturbations are negligible, though not the admixture regime where both inflaton and curvaton contribute to the spectrum.