U.S.-Federal Republic of Germany Cooperative Research: Lattice Gauge Theory Simulations

该奖项支持佛罗里达州立大学的Bernd Berg教授和他的几名研究生对德意志联邦共和国比勒费尔德大学物理系进行合作研究访问，在那里他们将与Bengt Petersson教授和其他人合作。他们致力于格点规范理论和计算的各种主题，包括对量子场论的大规模计算机模拟，特别是量子色动力学(QCD)。这家德国集团一直主要使用一台克雷计算机，并可以免费使用比勒费尔德和朱利希的几个超级计算机设施。这样的经历将提升这家美国集团的能力，该集团一直在研究网络和ETA超级计算机。QCD是公认的强粒子相互作用理论的候选者。它通常与小于1费米=10到负12厘米的刻度有关。在实验上，用大型对撞机研究如此小的距离；对非常早期宇宙的遗迹的观察也提供了信息。试图从QCD计算实际数字存在严重的技术困难。目前，克服这些困难的主要方法是通过大规模的计算机模拟。这一合作提议的一部分是利用有限尺寸标度概念来阐明许多开放的QCD问题。另一个方面涉及率先使用超级计算机作为研究量子引力相关问题的新工具。

This award supports Professor Bernd Berg of Florida State University and several of his graduate students for >collaborative research visits to the Physics Department of the University of Bielefeld, Federal Republic of Germany, where they will work with Professor Bengt Petersson and others. They are working on a variety of topics in lattice gauge theory and computation, including large scale computer simulations of quantum field theories, in particular Quantum Chromodynamics (QCD). The German group has been working mainly with a Cray computer, and has free access to several supercomputer facilities at Bielefeld and Juelich. Such experience will upgrade the capabilities of the U.S. group, which has been working on Cyber and ETA supercomputers. QCD is the generally accepted candidate for the theory of strong particle interactions. It is typically relevant at scales which are smaller than 1 Fermi = 10 to the minus 12th centimeter. Experimentally such small distances are investigated with large colliders; observations of relics from the very early universe also provide information. There are severe technical difficulties in trying to calculate actual numbers from QCD. Presently, the leading approach to overcome these difficulties is by means of large scale computer simulations. Part of this collaborative proposal is to exploit finite size scaling concepts to shed light on many open QCD problems. Another aspect involves pioneering the use of supercomputers as a new tool for investigating quantum gravity related problems.