Lecture Notes on Non-Gaussianity
Lecture Notes on Non-Gaussianity
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DOI：
10.1007/978-3-319-44769-8_3
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发表时间：
2014-11
期刊：
影响因子：
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通讯作者：
C. Byrnes
中科院分区：
文献类型：
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作者：
C. Byrnes
我们讨论了如何原始的非高斯的曲率扰动有助于约束早期宇宙的模型。观测结果与高斯初始条件相一致，与最简单的暴胀模型的预测相一致。偏差被限制在低于百分之一的水平，约束替代模型，如具有多个场、非规范动力学项或打破慢滚条件的模型。我们介绍了一些最重要的通货膨胀模型，产生非高斯扰动，并提供实用的工具，如何计算的三点相关函数的一个流行的类非高斯模型。总结了该领域的现状，并给出了展望。
We discuss how primordial non-Gaussianity of the curvature perturbation helps to constrain models of the early universe. Observations are consistent with Gaussian initial conditions, compatible with the predictions of the simplest models of inflation. Deviations are constrained to be at the sub percent level, constraining alternative models such as those with multiple fields, non-canonical kinetic terms or breaking the slow-roll conditions. We introduce some of the most important models of inflation which generate non-Gaussian perturbations and provide practical tools on how to calculate the three-point correlation function for a popular class of non-Gaussian models. The current state of the field is summarised and an outlook is given.