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Quantum fluctuations during cosmic inflation

宇宙膨胀期间的量子涨落

基本信息

批准号：
2097594
负责人：
金额：
--
依托单位：
University of Portsmouth
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2018
资助国家：
英国
起止时间：
2018 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2097594
关键词：
Quantum fluctuations during cosmic inflation

项目摘要

Cosmological inflation describes an accelerated expansion of the Universe at ultra-high energies in the very early universe. It is the simplest explanation for the large-scale homogeneity and isotropy of our Universe but, crucially, it also generates primordial density perturbations which go on to form the large-scale structure of our universe. Small-scale quantum field fluctuations during inflation are swept up by the rapid expansion to astronomical scales. Primordial perturbations produced by inflation are thus a probe of the effective field theory and different particle species at ultra-high energies.This project will explore inflationary dynamics in different theoretical models and the generation of primordial perturbations. We will investigate how the statistical properties of perturbations in the cosmic microwave background and large-scale galaxy surveys are sensitive to the particle physics theory. In particular we will consider the imprint of higher spin fields in the scalar (density) and tensor (gravitational wave) power spectra and higher-order correlators and cross-correlations. We will also consider the role that long-wavelength quantum fluctuations play in the stochastic distribution of field values during inflation on scales even beyond our observable horizon. Ultimately our aim is to make quantitative statistical comparisons of the evidence for different theoretical models of inflation.

宇宙暴胀描述了宇宙在极早期的超高能量下加速膨胀。这是对我们宇宙的大尺度均匀性和各向同性的最简单解释，但至关重要的是，它也产生了原始密度扰动，这些扰动继续形成我们宇宙的大尺度结构。暴胀期间的小尺度量子场涨落被迅速膨胀到天文尺度所扫除。因此，由暴胀所产生的原初微扰是有效场论和超高能不同粒子种类的一个探索。本项目将探讨不同理论模型中的暴胀动力学和原初微扰的产生。我们将研究宇宙微波背景和大尺度星系巡天中微扰的统计特性对粒子物理理论的敏感性。特别地，我们将考虑标量（密度）和张量（引力波）功率谱中较高自旋场的印记，以及高阶标量和互相关。我们还将考虑长波量子涨落在暴胀期间场值的随机分布中所起的作用，甚至在我们可观察的视界之外。最终，我们的目标是对不同的通货膨胀理论模型的证据进行定量统计比较。