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arXiv 2106.06402hep-thhep-lathep-ph
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手征规范理论中的离散反常

On Discrete Anomalies in Chiral Gauge Theories

Philip Boyle Smith, Avner Karasik, Nakarin Lohitsiri, David Tong

摘要:

我们研究了两个著名的具有费米子的手征规范理论的对称表示、反对称表示和基本表示。我们给出了详细的描述的全球对称性,包括各种离散的对称性。最近的研究认为,这些理论表现出一种微妙的mod 2异常,排除了某些理论限制而不破坏其整体对称性的阶段,在红外线中留下一个无隙复合费米子。我们指出,不存在这种反常现象。我们进一步展示了一个明确的路径,无带隙费米子阶段,表明没有运动学障碍,实现这些阶段。

英文摘要:

We study two well-known $SU(N)$ chiral gauge theories with fermions in the symmetric, anti-symmetric and fundamental representations. We give a detailed description of the global symmetry, including various discrete quotients. Recent work argues that these theories exhibit a subtle mod 2 anomaly, ruling out certain phases in which the theories confine without breaking their global symmetry, leaving a gapless composite fermion in the infra-red. We point out that no such anomaly exists. We further exhibit an explicit path to the gapless fermion phase, showing that there is no kinematic obstruction to realising these phases.

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