arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.09117hep-th
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6d中离散1-形式对称的命运

The Fate of Discrete 1-Form Symmetries in 6d

Fabio Apruzzi, Markus Dierigl, Ling Lin

摘要:

最近引入的广义整体对称性对于理解四维和更低维的量子场论的非微扰方面是有用的。本文主要研究与动力学张量多重态耦合的弱耦合6d超对称规范理论的1-形式对称性。我们研究了对应于规范群中心的整体1-形式对称性的一致性,或子群,通过激活它们的背景场,这使得瞬子密度分数。在6d中,给定规范理论的瞬子背景通过蝌蚪相消产生BPS弦。非平凡的1-形式对称背景组态对BPS弦的电荷有贡献。然而,狄拉克量子化对一致的1-形式背景施加了限制,因为它们通常会导致和诱导分数电荷,从而使假定的高阶形式对称性(部分)不一致。这给出了明确的标准,以确定是否实现离散1-形式对称。我们实现这些标准的具体例子源于字符串紧化。我们还证实了这一点,发现一个非平凡的分数贡献有关的状态,明确打破全球1-形式的对称性出现大规模激发的6D BPS字符串。对于始终与引力耦合的6d理论来说,这暗示着一个对称性破缺的状态之塔。当分数贡献不存在时,理论的F-理论实现指向通过非平凡的Mordell-Weil扭转的存在来测量1-形式对称性。

英文摘要:

Recently introduced generalized global symmetries have been useful in order to understand non-perturbative aspects of quantum field theories in four and lower dimensions. In this paper we focus on 1-form symmetries of weakly coupled 6d supersymmetric gauge theories coupled to dynamical tensor multiplets. We study the consistency of global 1-form symmetries corresponding to the center of the gauge groups, or subgroups thereof, by activating their background fields, which makes the instanton density fractional. In 6d, an instanton background for a given gauge theory sources BPS strings via tadpole cancellation. The non-trivial 1-form symmetry background configurations contribute to the charge of the BPS strings. However, Dirac quantization imposes restrictions on the consistent 1-form backgrounds, since they can in general lead to and induce fractional charges, thus making (part of) the putative higher-form symmetry inconsistent. This gives explicit criteria to determine whether the discrete 1-form symmetries are realized. We implement these criteria in concrete examples originating from string compactifications. We also corroborate this by finding that a non-trivial fractional contribution is related to states which explicitly break the global 1-form symmetry appearing as massive excitations of the 6d BPS strings. For 6d theories consistently coupled to gravity, this hints at a symmetry breaking tower of states. When the fractional contributions are absent, the F-theory realization of the theories points to the gauging of the 1-form symmetry via the presence of non-trivial Mordell--Weil torsion.

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