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arXiv 2004.05668hep-thgr-qc
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关于电磁对偶性和软电荷的注记

A note on electric-magnetic duality and soft charges

Marc Henneaux, Cédric Troessaert

摘要:

我们在Minkoswki空间中导出了电磁学显对偶不变式的渐近对称性。我们表明,行动是两个代数下的角度依赖$u(1)$变换,一个电和其他磁不变。在标准的电公式中,洛伦兹不变性需要在无穷远处增加额外的边界自由度,这里发现有电和磁两种类型。这个对偶对称公式的一个显著特点是,规范生成元的零模的壳层值仅等于电通量和磁通量的一半(另一半是由狄拉克弦型贡献带来的)。另一个显著的特征是在依赖于角度的$u(1)^2$ -代数中没有中心扩张。

英文摘要:

We derive the asymptotic symmetries of the manifestly duality invariant formulation of electromagnetism in Minkoswki space. We show that the action is invariant under two algebras of angle-dependent $u(1)$ transformations, one electric and the other magnetic. As in the standard electric formulation, Lorentz invariance requires the addition of additional boundary degrees of freedom at infinity, found here to be of both electric and magnetic types. A notable feature of this duality symmetric formulation, which we comment upon, is that the on-shell values of the zero modes of the gauge generators are equal to only half of the electric and magnetic fluxes (the other half is brought in by Dirac-string type contributions). Another notable feature is the absence of central extension in the angle-dependent $u(1)^2$-algebra.

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