Modifications of Gravity and Early Universe Cosmology

引力和早期宇宙宇宙学的修正

• 批准号: 2609858
• 金额: --
• 依托单位: University of Sheffield
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2609858
• 关键词: Modifications; Gravity; Early; Universe; Cosmology

In order to make predictions which can be tested with experiments, mathematical models describing the universe it its early stages require the use of cosmological perturbation theory. In this research the student will initially study a specific theory of gravity, determine the predictions of the power spectrum of linear perturbations produced during a phase of inflation in the early universe. The statistical properties of the perturbations are also studied. The aim is to check whether large non-Gaussianities can also imply that the power spectrum to be no longer of power-law form. In subsequent work, f(R) theories of gravity of the early universe are investigated. The work will consist of both analytical work (cosmological perturbation theory in particular) and numerical work.

为了做出可以用实验检验的预测，描述宇宙早期阶段的数学模型需要使用宇宙学微扰理论。在这项研究中，学生将首先学习特定的引力理论，确定在早期宇宙膨胀阶段产生的线性扰动功率谱的预测。并研究了微扰的统计性质。其目的是检查大型非高斯性是否也意味着功率谱不再是幂定律形式。在随后的工作中，我们研究了早期宇宙的f(R)引力理论。这项工作将包括分析工作(特别是宇宙学微扰理论)和数值工作。