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arXiv 1012.2562hep-lathep-phhep-th
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格点上Yang-Mills理论中胶球质量和矩阵元计算的新方法

A novel approach for computing glueball masses and matrix elements in Yang-Mills theories on the lattice

Michele Della Morte, Leonardo Giusti

摘要:

我们利用杨-米尔斯理论在晶格上的全局对称性来设计一种新的计算策略,用于提取胶球质量和矩阵元素,其相对于标准技术实现了统计误差的指数级降低。通过推广我们以前关于宇称对称性的工作,该理论的配分函数被分解为路径积分之和,每个路径积分给出了与宇称、电荷共轭、平移、旋转和中心共轭相关的具有固定量子数的多重态的贡献^[3]。路径积分和关联函数的比率,然后可以计算与多级Monte Carlo积分方案的数值成本,在一个固定的统计精度和渐近大的时间,增加与时间的晶格范围的幂。该策略在SU(3)杨-米尔斯理论中得到了实现,并在晶格间距为0.17 fm时对真空量子数的最轻胶球的质量和多重数进行了全面的计算.

英文摘要:

We make use of the global symmetries of the Yang-Mills theory on the lattice to design a new computational strategy for extracting glueball masses and matrix elements which achieves an exponential reduction of the statistical error with respect to standard techniques. By generalizing our previous work on the parity symmetry, the partition function of the theory is decomposed into a sum of path integrals each giving the contribution from multiplets of states with fixed quantum numbers associated to parity, charge conjugation, translations, rotations and central conjugations Z_N^3. Ratios of path integrals and correlation functions can then be computed with a multi-level Monte Carlo integration scheme whose numerical cost, at a fixed statistical precision and at asymptotically large times, increases power-like with the time extent of the lattice. The strategy is implemented for the SU(3) Yang--Mills theory, and a full-fledged computation of the mass and multiplicity of the lightest glueball with vacuum quantum numbers is carried out at a lattice spacing of 0.17 fm.

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