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Multifield effects in string cosmology

弦宇宙学中的多场效应

基本信息

批准号：
1781279
负责人：
金额：
--
依托单位：
University of Cambridge
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2016
资助国家：
英国
起止时间：
2016 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=studentship-1781279
关键词：
Multifield effects string cosmology

项目摘要

Observational cosmology will make great strides over the coming decade. Ground-based experiments will observe the polarisation of the Cosmic Microwave Background (CMB) with exceptional accuracy, and new satellite missions will map out the large-scale distribution of matter in the universe (LSS) to an unprecedented depth and precision. The CMB polarisation and the matter distribution both carry imprints of the primordial, very high-energy physics governing the early universe. Hence, these experiments provide rare, new opportunities to learn about fundamental theory from cosmology. Unfortunately, for several of the phenomenological parameters that experiments will constrain, the theoretically expected values or distributions are not known. This significantly limits the scientific impact of these large observational efforts, and may even lead to significant discoveries passing unnoticed. The goal of this project is to address this issue: by developing new tools for studying multiple-field systems in the low-energy limits of string compactifications and in field theory, this project will provide novel methods for computing the relevant cosmological observables from interesting extensions of particle physics at high energies. These techniques will for the first time allow for a systematic approach to multiple-field inflation and reheating in string theory, and will significantly extend the state-of-the-art in those fields. The results will provide robust targets for cosmological experiments, and will provide a framework in which new observational data from the next generation of CMB and LSS experiments can be interpreted.

观测宇宙学将在未来十年取得长足进步。地面实验将以极高的精度观测宇宙微波背景(CMB)的偏振，新的卫星任务将以前所未有的深度和精度绘制出宇宙中物质(LSS)的大规模分布。CMB的极化和物质分布都带有统治早期宇宙的原始、非常高能物理的印记。因此，这些实验为从宇宙学中学习基础理论提供了难得的新机会。不幸的是，对于实验将约束的几个现象学参数，理论上的期望值或分布是未知的。这大大限制了这些大型观测工作的科学影响，甚至可能导致重大发现被忽视。这个项目的目标是解决这个问题：通过开发新的工具来研究弦紧化低能极限下的多场系统和场论，这个项目将提供新的方法来计算从高能粒子物理的有趣扩展中获得的相关宇宙学观测值。这些技术将首次允许系统地处理弦理论中的多场充气和再加热，并将显著扩展这些领域的最先进技术。这些结果将为宇宙学实验提供强有力的目标，并将提供一个框架，在其中可以解释来自下一代CMB和LSS实验的新观测数据。