晶格手征性、反常匹配及镜像费米子的（非）退耦
Lattice chirality, anomaly matching, and more on the (non)decoupling of mirror fermions
摘要：
研究了具有强汤川相互作用和多费米子相互作用的格点模型中的t Hooft反常匹配。在类矢量格点规范理论中引入镜像费米子之间的强非规范相互作用，目的是在强耦合对称相中得到一个长距离不间断的手征费米子复表象规范理论.我们展示了如何利用精确的晶格手征性来分析有限晶格间距和体积下手征对称性电流算符的反常匹配条件。我们用蒙特卡罗方法研究了在强镜汤川耦合下，具有反常镜费米子含量的玩具二维模型中反常匹配的实现。我们表明，t Hooft异常匹配是满意的，在大多数的相图中，通过最小的解决方案，无论是在无质量费米子或“Goldstone”模式，而在某些情况下，有额外的无质量矢量镜像费米子。因此，强耦合时的镜像光谱与长距离幺正性一致。我们讨论了我们的研究结果的影响，为未来的研究最有趣的情况下，无异常的镜像费米子部门的去耦。
英文摘要：
We study 't Hooft anomaly matching in lattice models with strong Yukawa or multi-fermion interactions. Strong non-gauge interactions among the mirror fermions in a vectorlike lattice gauge theory are introduced with the aim to obtain, in a strong-coupling symmetric phase, a long-distance unbroken gauge theory with chiral fermions in a complex representation. We show how to use exact lattice chirality to analyze the anomaly matching conditions on chiral symmetry current correlators at finite lattice spacing and volume. We perform a Monte Carlo study of the realization of anomaly matching in a toy two-dimensional model with an anomalous mirror-fermion content at strong mirror Yukawa coupling. We show that 't Hooft anomaly matching is satisfied, in most of the phase diagram, via the minimal solution in either the massless fermion or "Goldstone" mode, while in some cases there are extra massless vectorlike mirror fermions. The mirror spectrum at strong coupling is thus consistent with long-distance unitarity. We discuss the implications of our results for future studies of the most interesting case of the decoupling of anomaly-free mirror-fermion sectors.
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