South-Eastern Particle Theory Alliance Sussex - RHUL - UCL 2020-2023 - Sussex node

这项拟议中的研究加入了苏塞克斯、皇家霍洛威和伦敦大学学院粒子理论小组的科学家们，在四个大标题下寻找新的物理学：对撞机和低能现象学：由大型强子对撞机提出的能量前沿的粒子碰撞，允许产生或排除比质子重数千倍的新粒子。在强度前沿，对粒子相互作用的极其精确的测量允许以间接的方式探测更重的粒子。在这里，我们探索和联合收割机两个方向，以解开世界的结构比以往任何时候都更小的距离，提出的问题，如：是什么使已知的粒子比量子引力的普朗克质量轻得多？有关于物质和力的统一理论吗？我们如何才能最好地利用现在和未来的实验来照亮它们？粒子天体物理学和宇宙学：过去十年中最活跃的研究领域之一是粒子物理学和宇宙学之间的界面。为了了解宇宙的历史，我们必须了解大爆炸最初时刻的物理定律，当时温度和粒子能量都很大。相反，通过今天对宇宙的详细观察，我们可以追溯到高能状态下的条件并推导出物理定律。我们的研究将解决宇宙的大问题：为什么物质比反物质多？中微子和暗物质的本质是什么？我们能用引力波来观察宇宙的第一皮秒吗？新的量子技术如何用于寻找暗物质和其他不可见粒子？量子理论和引力如何结合，我们能在宇宙中看到它们的联合效应吗？量子场论的不动点：最近的发现，标准模型类理论可以是基本的和预测的最高能量，而不是渐近自由，这为未知领域打开了一扇大门。这些新的理论提供了替代方法来完成标准模型，并从一个全新的角度解决其开放的挑战。我们的研究将集中于对这些新类型理论的系统评价，包括标准模型之外的基准模型的构建。我们将联合收割机的这些研究与我们对广义相对论的量子版本的持续探索相结合，并将这些预测与粒子对撞机和宇宙学的数据进行对比。高能物理学的工具：高亮度LHC（HL-LHC）被宣布为欧洲粒子物理战略的首要任务，并将在未来十年主导对撞机物理学。这个科学领域的目标是改善与现象学相关的BSM场景的工具，以便满足HL-LHC的需求。

The proposed research joins scientists of the particle theory groups at Sussex, Royal Holloway and University CollegeLondon in the hunt for new physics under four broad headings:Collider and low-energy phenomenology:Particle collisions at the energy frontier, presented by the Large Hadron Collider, allow to produce or rule out conjectured new particles thousands of times as heavy as the proton. At intensity frontier, extremely precise measurements of particle interactions allow to probe for even heavier particles in an indirect fashion. Here we explore and combine both directions to unravel the structure of the world at smaller distances than ever, asking questions such as: what makes the known particles so much lighter than the Planck mass of quantum gravity? Is there a unified theory of matter and forces? And how can we best use present and future experiments to shine light on them?Particle astrophysics and cosmology:One of the most active areas of research in the past decade has been at the interface between particle physics and cosmology. In order to understand the history of the Universe we must understand physical laws in the first moments of the Big Bang, when temperatures and particle energies were huge. Conversely, by detailed observations of the universe today we can trace back the conditions and make deductions about physical laws at high energies.Our research will tackle big questions about the universe: why is there more matter than antimatter? what is the nature of neutrinos and dark matter? can we use gravitational waves to look at the first picoseconds of the Universe? how can the new quantum technology be used to search for dark matter and other invisible particles? and how can quantum theory and gravity be combined, and can we see their joint effects in the cosmos?Fixed points of quantum field theory:The recent discovery that Standard Model-like theories can be fundamental and predictive up to highest energies withoutbeing asymptotically free has opened a door into uncharted territory. These novel theories offer alternative ways to UVcomplete the Standard Model and to address its open challenges from an entirely new angle. Our research will focus onthe systematic evaluation of these new types of theories, including the construction of benchmark models beyond theStandard Model. We combine these studies with our continuing quest towards a quantum version of general relativity.Predictions of these scenarios will be contrasted with data from particle colliders and cosmology.Tools for high energy physics:The high-luminosity LHC (HL-LHC) was announced as top priority of the European Strategy for Particle Physics and will dominate collider physics in the next decade. The aim of this science area is to improve tools for phenomenologically relevant BSM scenarios so that they meet the needs of the HL-LHC.