Lattice Gauge Theory at the University of the Pacific 2016-2019
太平洋大学格子规范理论 2016-2019
基本信息
- 批准号:1620845
- 负责人:
- 金额:$ 21万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2016
- 资助国家:美国
- 起止时间:2016-09-01 至 2020-08-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
This award funds the research activities of Professors James Hetrick and Kieran Holland at the University of the Pacific. The experimental program at the Large Hadron Collider (LHC) has ushered in a new era in particle physics with the discovery of the Higgs boson in 2012. By colliding protons at the highest-ever energy in a controlled environment, we are learning how symmetries are broken in nature and how the universe evolved from the earliest moments after the Big Bang to the present state billions of years later. The goal of particle physics is to understand the basic laws of how fundamental particles, like electrons and quarks, interact with one another and how their collective dynamics shape the universe. Experimental results provided by the LHC are the essential ingredient to sort through all the possible models that could describe the universe and focus on those which give us a deeper and better understanding of what we observe. In addition to the LHC, the experimental program at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory probes the early-universe behavior of quarks and gluons, which formed a hot dense plasma before cooling as the universe expanded, leading to the creation of protons, neutrons and in turn atoms and molecules. Here, the relevant theory of quantum chromodynamics (QCD) is needed with ever-higher precision to predict how this transition occurred. As part of this project, Professors Hetrick and Holland will investigate new physics models which potentially elucidate the properties of the Higgs boson, whose relatively light mass is an unexplained mystery. They will also study QCD and similar models, using computer simulations for better insight into strongly-interacting systems. This work is therefore aligned with the national interest in that it reinforces the progress of fundamental science in the United States. This work also has a significant broader impact, giving undergraduate students at the University of the Pacific an opportunity to work on modern-day research, such as learning numerical simulation techniques. More technically, Professor Holland will be studying strongly-interacting composite Higgs models, which postulate a new gauge force analogous to QCD. In such theories, the Higgs boson emerges as a bound state, much like a pion forms via the strong binding of quarks. Such models could explain why the Higgs boson is relatively light if the new gauge theory has near-conformal behavior. This leads to predictions of additional bound states that should be observed at the LHC, which are now reaching to the level of being detected or ruled out. Like QCD, such models require numerical lattice simulations on supercomputers in order to make reliable predictions. Professor Hetrick will be working on an alternate idea in which the properties of the Higgs boson emerge from a higher-dimensional theory via the Hosotani mechanism, where particular boundary conditions break the symmetry. Again, numerical computations are needed to test such theories and compare them against current experimental results. Both Professors Holland and Hetrick will also be studying properties of QCD as well, such as how the theory simplifies as the symmetry is increased, as well as providing technical support for the sharing of numerical resources across the international research community.
该奖项资助了太平洋大学的James Hetrick和Kieran Holland教授的研究活动。2012年,随着希格斯玻色子的发现,大型强子对撞机(LHC)的实验项目开启了粒子物理学的新时代。通过在受控环境中以最高能量碰撞质子,我们正在了解自然界的对称性是如何被打破的,以及宇宙是如何从大爆炸后最早的时刻进化到数十亿年后的今天的状态的。粒子物理学的目标是了解基本粒子(如电子和夸克)如何相互作用以及它们的集体动力学如何塑造宇宙的基本定律。大型强子对撞机提供的实验结果是对所有可能描述宇宙的模型进行分类的基本要素,并将重点放在那些能让我们更深入、更好地理解我们所观察到的东西的模型上。除了大型强子对撞机,布鲁克海文国家实验室的相对论重离子对撞机(RHIC)的实验项目还探测了夸克和胶子的早期宇宙行为,这些夸克和胶子形成了一个热的致密等离子体,然后随着宇宙的膨胀而冷却,从而产生了质子、中子以及原子和分子。在这里,需要量子色动力学(QCD)的相关理论以更高的精度来预测这种转变是如何发生的。作为该项目的一部分,Hetrick教授和Holland教授将研究新的物理模型,这些模型有可能阐明希格斯玻色子的特性,希格斯玻色子相对较轻的质量是一个无法解释的谜。他们还将研究QCD和类似的模型,使用计算机模拟来更好地了解强相互作用的系统。因此,这项工作符合国家利益,因为它加强了美国基础科学的进步。这项工作还具有重要的广泛影响,为太平洋大学的本科生提供了从事现代研究的机会,例如学习数值模拟技术。从技术上讲,霍兰德教授将研究强相互作用的复合希格斯模型,该模型假设一种类似于QCD的新规范力。在这样的理论中,希格斯玻色子以束缚态出现,很像介子通过夸克的强结合而形成。这样的模型可以解释为什么如果新的规范理论具有接近共形的行为,那么希格斯玻色子相对较轻。这导致了对在大型强子对撞机上应该观察到的额外束缚态的预测,这些状态现在已经达到了被检测到或被排除的水平。像QCD一样,这样的模型需要在超级计算机上进行数值点阵模拟,以便做出可靠的预测。赫特里克教授将研究另一种想法,即希格斯玻色子的性质通过细谷机制从高维理论中出现,其中特定的边界条件打破了对称性。同样,需要数值计算来验证这些理论,并将它们与当前的实验结果进行比较。Holland教授和Hetrick教授也将研究QCD的性质,比如对称性增加时理论如何简化,以及为国际研究界的数值资源共享提供技术支持。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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James Hetrick其他文献
James Hetrick的其他文献
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{{ truncateString('James Hetrick', 18)}}的其他基金
Lattice Gauge Theory at the University of the Pacific
太平洋大学的格子规范理论
- 批准号:
1318220 - 财政年份:2013
- 资助金额:
$ 21万 - 项目类别:
Continuing Grant
QCD Physics and Beyond the Standard Model on the Lattice
QCD 物理和超越晶格标准模型
- 批准号:
0970137 - 财政年份:2010
- 资助金额:
$ 21万 - 项目类别:
Continuing Grant
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