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Anomaly-safe discrete groups
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DOI：10.1016/j.physletb.2015.05.047.png)
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Abstract
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We show that there is a class of finite groups, the so-called perfect groups, which cannot exhibit anomalies. This implies that all non-Abelian finite simple groups are anomaly-free. On the other hand, non-perfect groups generically suffer from anomalies. We present two different ways that allow one to understand these statements. (C) 2015 The Authors. Published by Elsevier B.V.
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GAUGE-SYMMETRY
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