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arXiv 0803.2744hep-lathep-th
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基于重叠Dirac矩阵的标量和张量规范算子的经典极限

Classical Limits of Scalar and Tensor Gauge Operators Based on the Overlap Dirac Matrix

Andrei Alexandru, Ivan Horvath, Keh-Fei Liu

摘要:

第二作者最近提出考虑QCD的格点公式,其中完整的作用量,包括规范部分,是从一个给定的狄拉克算子D显式地建立起来的。在这种理论的一个简单例子中,规范作用量与用来定义夸克动力学的金斯帕-威尔逊算符D的迹成正比。这种构造依赖于格点规范算符tr D(x,x)的经典极限与tr F.F(x)成比例(直到一个加性常数)的命题。在这里,我们表明,重叠狄拉克算子的情况下,使用分析和数值方法。我们也对D的张量分量进行了同样的分析,它与场强张量F类似,并获得了与我们以前使用不同方法的推导相同的结果。在较宽的负质量参数值范围内,高精度地计算了相应的比例常数,并验证了它们在有限体积和无限体积中是相同的。

英文摘要:

It was recently proposed by the second author to consider lattice formulations of QCD in which complete actions, including the gauge part, are built explicitly from a given Dirac operator D. In a simple example of such theory, the gauge action is proportional to the trace of Ginsparg-Wilson operator D chosen to define the quark dynamics. This construction relies on the proposition that the classical limit of lattice gauge operator tr D(x,x) is proportional to tr F.F(x) (up to an additive constant). Here we show this for the case of the overlap Dirac operator using both analytical and numerical methods. We carry out the same analysis also for the tensor component of D, which is similarly related to the field-strength tensor F, and obtain results identical to our previous derivation that used different approach. The corresponding proportionality constants are computed to high precision for wide range of the negative mass parameter values, and it is verified that they are the same in finite and infinite volumes.

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