Higher order statistics of curvature perturbations in IFF model and its Planck constraints
Higher order statistics of curvature perturbations in IFF model and its Planck constraints
复制标题
DOI：
10.1088/1475-7516/2013/09/009
复制
发表时间：
2013-06
影响因子：
6.4
通讯作者：
Tomohiro Fujita;Shuichiro Yokoyama
中科院分区：
文献类型：
--
作者：
Tomohiro Fujita;Shuichiro Yokoyama
计算了动力学耦合模型（IFF模型）中电磁场在暴胀过程中引起的曲率扰动的功率谱和非线性参数fNL和τNL。利用Planck合作组的观测结果，对模型的约束条件进行了全面的研究。有趣的是，如果单个慢滚动暴胀子是观测到的π的原因，那么τNL的约束是最严格的。我们还发现在这个模型中产生的fNL和τNL之间的一般关系。即使fNL ~（1），也能产生可检测的τNL。
We compute the power spectrum ζ and non-linear parameters fNL and τNL of the curvature perturbation induced during inflation by the electromagnetic fields in the kinetic coupling model (IFF model). By using the observational result of ζ,fNL and τNL reported by the Planck collaboration, we study the constraint on the model comprehensively. Interestingly, if the single slow-rolling inflaton is responsible for the observed ζ, the constraint from τNL is most stringent. We also find a general relationship between fNL and τNL generated in this model. Even if fNL ~ (1), a detectable τNL can be produced.