标题： 有限静夸克密度下的量子色动力学 显示英文标题

标题： QCD at a Finite Density of Static Quarks

摘要： 近期，聚类方法已被用于解决各种标志问题，包括出现在费米子存在时出现的那些问题。在所有情况下，路径积分中一类构型的解析部分重求和都是必要的。这里以有限静态夸克密度下的量子色动力学为例来说明这些新思想。在这种极限情况下，由于费米部分解耦，标志问题得以简化。此外，当规范动力学被Potts模型取代时，该问题可以完全得到解决。另一方面，在轻夸克的量子色动力学中，解决方案将需要对费米子和规范自由度进行部分重求和。这种新方法指出了在寻找解决这一更具挑战性的标志问题时未被探索的方向。 显示英文摘要

摘要： Recently, cluster methods have been used to solve a variety of sign problems including those that arise in the presence of fermions. In all cases an analytic partial re-summation over a class of configurations in the path integral was necessary. Here the new ideas are illustrated using the example of QCD at a finite density of static quarks. In this limit the sign problem simplifies since the fermionic part decouples. Furthermore, the problem can be solved completely when the gauge dynamics is replaced by a Potts model. On the other hand in QCD with light quarks the solution will require a partial re-summation over both fermionic and gauge degrees of freedom. The new approach points to unexplored directions in the search for a solution to this more challenging sign problem.