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Anomalies and bounds on charged operators

机译:收费运营商的异常和界限

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We study the implications of the ’t Hooft anomaly (i.e., obstruction to gauging) on conformal field theory, focusing on the case when the global symmetry is Z 2 . Using the modular bootstrap, universal bounds on ( 1 + 1 )-dimensional bosonic conformal field theories with an internal Z 2 global symmetry are derived. The bootstrap bounds depend dramatically on the ’t Hooft anomaly. In particular, there is a universal upper bound on the lightest Z 2 odd operator if the symmetry is anomalous, but there is no bound if the symmetry is nonanomalous. In the nonanomalous case, we find that the lightest Z 2 odd state and the defect ground state cannot both be arbitrarily heavy. We also consider theories with a U ( 1 ) global symmetry, and comment that there is no bound on the lightest U ( 1 ) charged operator if the symmetry is nonanomalous.
机译:我们研究了总体上对称性为Z 2的情况下的Hooft异常(即,对测量的阻碍)对共形场理论的影响。使用模块化引导程序,得出具有内部Z 2全局对称性的(1 + 1)维玻色子共形场理论的通用界。引导范围在很大程度上取决于’Hooft异常。特别是,如果对称性异常,则最轻的Z 2奇数运算符有一个通用上限,但是如果对称性非异常,则没有上限。在非异常情况下,我们发现最轻的Z 2奇数态和缺陷基态都不能任意重。我们还考虑了具有U(1)全局对称性的理论,并评论说,如果对称性是非异常的,则最轻的U(1)带电算子就没有约束。

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