Lattice Field Theory and Hadronic Physics

晶格场论和强子物理

• 批准号: 0854744
• 负责人: Rajamani Narayanan
• 金额: $ 28.52万
• 依托单位: Florida International University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-06-01 至 2014-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0854744&HistoricalAwards=false
• 关键词: Lattice; Field; Theory; Hadronic; Physics

Quarks carry a color charge and nuclear matter is formed from the binding of colored quarks mediated by gluons. Quantum Chromo-Dynamics (QCD) is the theory that describes the interaction of these color charges. Experiments have shown than quarks come in three colors but all nuclear matter is color neutral. Separation of nuclear matter into quarks and gluons needs very large energies similar to what was present in the early universe. Since solving QCD with three colors have proven to be very difficult and since qualitative properties do not depend on the number of colors, an attempt following 't Hooft is made to solve QCD for a very large number of colors. Research using lattice gauge theory has proven to be quite useful in extracting several physics results in the last six years. We will continue to make progress and focus on the phase of the theory that exists at high densities (like inside neutron stars) and high temperatures (close to the big-bang). Numerical computations will be used to study quark matter in this phase and we will attempt to make qualitative comparisons with current experiments in RHIC and CERN. Since QCD in the limit of large number of colors is closely related to recent developments in string theory we will also be able to make connections between field theory and string theory. We have already shown that quarks form a colorless condensate and we have also succeeded in computing the properties of the lightest colorless particle - the pion. We will attempt to compute the masses of other heavier colorless particles as part of this proposal. We will also attempt to study the effect of temperature thereby showing evidence for the formation of nuclear matter from a primordial soup of quarks and gluons.The scientific methods involve analytical calculations and numerical computations. A graduate student at FIU working toward a Ph.D will learn quantum field theory and numerical techniques and will make significant contributions. Computer clusters will be used for numerical computations and the results obtained as part of this proposal will be presented at international conferences in nuclear and particle physics.

夸克携带有色电荷，核物质是由胶子介导的有色夸克的结合形成的。量子色动力学(QCD)是描述这些颜色电荷相互作用的理论。实验表明，夸克有三种颜色，但所有的核物质都是中性的。将核物质分离成夸克和胶子需要非常大的能量，类似于早期宇宙中存在的能量。由于求解三种颜色的QCD已被证明是非常困难的，并且由于定性属性不依赖于颜色的数量，因此尝试遵循t Hooft来求解非常大量的颜色的QCD。在过去的六年里，使用格点规范理论的研究已经被证明在提取几个物理结果方面非常有用。我们将继续取得进展，专注于存在于高密度(如中子星内部)和高温(接近大爆炸)的理论阶段。在这一阶段，我们将使用数值计算来研究夸克物质，我们将尝试与RHIC和CERN目前的实验进行定性比较。由于大量颜色极限中的QCD与弦理论的最新发展密切相关，我们也将能够在场论和弦理论之间建立联系。我们已经证明了夸克形成了一种无色凝聚体，我们还成功地计算了最轻的无色粒子--pion的性质。作为这一提议的一部分，我们将尝试计算其他较重的无色粒子的质量。我们还将尝试研究温度的影响，从而为夸克和胶子的原始汤汤形成核物质提供证据。科学方法包括分析计算和数值计算。在FIU攻读博士学位的研究生将学习量子场论和数值技术，并将做出重大贡献。计算机集群将用于数值计算，作为这一提议的一部分而获得的结果将在核物理和粒子物理的国际会议上公布。