One-loop perturbative coupling of A and A★ through the chiral overlap operator
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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*, 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*, even if the anomaly cancellation condition is met. These non-vanishing terms would lead an undesired perturbative spectrum in the formulation.
2021 ◽
Vol 36
(02)
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pp. 2150010
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2020 ◽
Vol 8
(1)
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pp. 38-45
1976 ◽
Vol 43
(1)
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pp. 255-259
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1989 ◽
Vol 04
(14)
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pp. 1343-1353
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1989 ◽
Vol 68
(2)
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pp. 435-441
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