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arXiv 1710.00536hep-lathep-th
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通过手征重叠算符实现$A$和$A_\star$的单圈微扰耦合

One-loop perturbative coupling of $A$ and $A_\star$ through the chiral overlap operator

Hiroki Makino, Okuto Morikawa, Hiroshi Suzuki

摘要:

最近,Grabowska和Kaplan在手征重叠算符的基础上构造了手征规范理论的四维格点形式。至少在树级近似下,左手费米子只与原规范场$A$耦合,而右手费米子只与规范场$A_\star$耦合,这是规范场$A$在具有无穷长流动时间的梯度流作用下的变形.在本文中,我们研究了费米子单圈有效作用量在它们的表述。我们表明,这种有效作用量的连续极限包含$A$和~ $A_\star$之间的局部相互作用项,即使满足异常取消条件。这些非零项将在公式中导致不期望的微扰谱。

英文摘要:

Recently, Grabowska and Kaplan constructed a four-dimensional lattice formulation of chiral gauge theories on the basis of the chiral overlap operator. At least in the tree-level approximation, the left-handed fermion is coupled only to the original gauge field~$A$, while the right-handed one is coupled only to the gauge field~$A_\star$, a deformation of~$A$ by the gradient flow with infinite flow time. In this paper, we study the fermion one-loop effective action in their formulation. We show that the continuum limit of this effective action contains local interaction terms between $A$ and~$A_\star$, even if the anomaly cancellation condition is met. These non-vanishing terms would lead an undesired perturbative spectrum in the formulation.

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