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Particle Theory at the Higgs Centre

希格斯中心的粒子理论

基本信息

批准号：
ST/L000334/1
负责人：
Richard Joseph Szabo
金额：
$ 17.41万
依托单位：
Heriot-Watt University
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2014
资助国家：
英国
起止时间：
2014 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=ST%2FL000334%2F1
关键词：
Particle Theory Higgs Centre

项目摘要

There are two types of fundamental forces in Nature: those responsible for particle interactions at subatomic scales and those responsible for the large scale structure of the universe. The former is described by Quantum Field Theories (QFT) such as the Standard Model(SM). Currently, our understanding of Nature at the most fundamentallevel is at the crossroads. Last year, the LHC at CERN collided protons at higher energies than ever before, and observed sufficient collisions to find a significant excess at 125 GeV,consistent with the Higgs boson of the SM. Over the coming years it should becomeclear whether this is indeed a SM Higgs, responsible for generating masses for vector bosons, leptons and quarks, or whether it is something different. It should also become clearer whether there is more physics at the TeV scale, or whether this is it. In either event, it is clear that this will be a transformative period in fundamental physics, making the next few years the most exciting time for a generation or more. Our programme of research at the Higgs Centre for Theoretical Physics in Edinburgh is designed to be at the forefront of these new discoveries: indeed Peter Higgs himself is Emeritus Professor here. Specifically, we provide theoretical calculations, using pen and paper, and the most powerful supercomputers, of both the huge number of background processes to be seen at LHC due to known physics, and the tiny signalsexpected in various models of new physics, in order to discriminate between signal and background, and thus maximise the discovery potential of the LHC. In parallel, we will attempt to understand the more complete picture of all the forces of Nature that may begin to emerge. The fundamental force responsible for large scale structure is described Einstein's General Theory of Relativity (GR). During the last three decades, string theory has emerged as a conceptually rich theoretical framework reconciling both GR and QFT. The low-energy limit of String Theory is supergravity (SUGRA), a nontrivial extension of GR in which the universe is described by a spacetime with additional geometric data. Members of the group have pioneered approaches to deriving observablecosmological consequences of String Theory, to studying how the geometrical notions on which GR is predicated change at very small ("stringy") distance scales, and the systematic classification of SUGRA backgrounds. The group is also engaged in using these theories to improve calculations in existing field theories. In summary, our research will impinge on both theoretical and computational aspects relevant to probing the phenomenology of incoming LHC data, and will also encompass a wide range of topics in QFT and gravitational aspects of String Theory, impinging on cosmology, particle physics and on the very nature of String Theory itself.

自然界中有两种基本力：一种是在亚原子尺度上负责粒子相互作用的力，另一种是负责宇宙大尺度结构的力。前者由量子场论（QFT）描述，如标准模型（SM）。目前，我们对自然最根本的理解正处于十字路口。去年，欧洲核子研究中心的大型强子对撞机以比以往更高的能量碰撞质子，并观察到足够的碰撞，发现125 GeV的显著过剩，与SM的希格斯玻色子一致。在接下来的几年里，它应该会弄清楚这是否真的是一个SM希格斯粒子，负责产生矢量玻色子，轻子和夸克的质量，或者它是否是不同的东西。我们也应该更清楚，是否有更多的物理学在TeV尺度上，或者是否这就是它。无论哪种情况，很明显，这将是基础物理学的一个变革时期，使未来几年成为一代人或更多人最激动人心的时刻。我们在爱丁堡希格斯理论物理中心的研究计划旨在成为这些新发现的最前沿：事实上，彼得·希格斯本人就是这里的名誉教授。具体来说，我们提供理论计算，使用笔和纸，以及最强大的超级计算机，由于已知的物理学，在LHC中可以看到大量的背景过程，以及在各种新物理模型中预期的微小信号，以便区分信号和背景，从而最大限度地提高LHC的发现潜力。与此同时，我们将试图理解所有可能开始出现的自然力量的更完整的图景。爱因斯坦的广义相对论（GR）描述了大尺度结构的基本力。在过去的三十年里，弦理论已经成为一个概念丰富的理论框架，调和了GR和QFT。弦论的低能极限是超引力（SUGRA），这是GR的非平凡扩展，其中宇宙由具有额外几何数据的时空描述。该小组的成员开创了方法来推导弦论的可观测的宇宙学后果，研究如何在非常小的（“弦”）距离尺度上预测GR的几何概念的变化，以及SUGRA背景的系统分类。该小组还致力于使用这些理论来改进现有场论的计算。总之，我们的研究将冲击理论和计算方面的相关探测传入LHC数据的现象，也将涵盖广泛的主题QFT和弦论的引力方面，冲击宇宙学，粒子物理学和弦论本身的性质。