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arXiv 1808.02701hep-lat
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用手征重叠算符计算规范反常

A calculation of the gauge anomaly with the chiral overlap operator

Taichi Ago

摘要:

本文研究了Grabowska和Kaplan提出的手征重叠算子的有效作用量的性质。他们提出了一个四维手征规范理论的格点公式,它是从他们的畴壁公式推导出来的。在该公式中,引入了额外维,沿额外维的规范场由梯度流演化。手征重叠算符满足Ginsparg-Wilson关系,并且只依赖于两个边界上的规范场。本文从任意偶数维手征重叠算子出发。我们将两个边界上的规范场独立处理,导出了在连续极限下用手征重叠算符计算规范反常的一般表达式。结果表明,在连续极限中,在二维、四维和六维中,手征重叠算符的规范反常与连续理论中已知的规范反常等价,直到全导数为止。

英文摘要:

We investigate the property of the effective action with the chiral overlap operator, which was derived by Grabowska and Kaplan. They proposed a lattice formulation of four-dimensional chiral gauge theory, which is derived from their domain-wall formulation. In this formulation, an extra dimension is introduced and the gauge field along the extra dimension is evolved by the gradient flow. The chiral overlap operator satisfies the Ginsparg-Wilson relation and only depends on the gauge fields on the two boundaries. In this paper, we start from the arbitrary even-dimensional chiral overlap operator. We treat the gauge fields on the two boundaries independently, and derive the general expression to calculate the gauge anomaly with the chiral overlap operator in the continuum limit. As a result, we show that the gauge anomalies with the chiral overlap operator in two, four, and six dimensions in the continuum limit is equivalent to those known in the continuum theory up to total derivatives.

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