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arXiv 1609.04461hep-th
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高自旋规范场和前势的扭曲自对偶性

Twisted self-duality for higher spin gauge fields and prepotentials

Marc Henneaux, Sergio Hörtner, Amaury Leonard

摘要:

证明了(自由)整数高自旋规范场的运动方程可以表示为自旋- $s$场及其对偶场的高自旋曲率的扭曲自对偶条件.我们专注于四维时空的情况下,但制定我们的结果适用于更高的时空维度的方式。扭曲的自对偶条件是冗余的,我们展示了一个非冗余的子集的条件,它具有显着的属性,只涉及一阶导数相对于时间。这个非冗余子集将自旋$s$场(我们定义)的电场等同于其对偶场(我们也定义)的磁场,反之亦然。扭曲自对偶条件的非冗余子集涉及自旋$s$场及其对偶场的纯空间分量,以及具有一个零指数的场的分量。我们可以通过取方程的旋度来去掉这些规范分量,这并不改变它们的物理内容。在这种形式中,扭曲自对偶条件可以从涉及前势的变分原理导出,前势是先前在自旋2和3情况下发现的前势的更高自旋推广。前势又一次具有既具有高自旋共形几何又具有高自旋自同构不变性的有趣特征。在早期的文件中介绍的工具,用于处理更高的自旋共形几何变成是至关重要的简化分析。在四维时空中,电场和磁场是同一类型的张量场,扭曲的自对偶条件享有$SO(2)$电磁不变性。我们明确地表明,这种对称性是一个“离壳对称”(即,作用的对称性,而不仅仅是运动方程的对称性)。对高维的推广给出了评论。

英文摘要:

We show that the equations of motion for (free) integer higher spin gauge fields can be formulated as twisted self-duality conditions on the higher spin curvatures of the spin-$s$ field and its dual. We focus on the case of four spacetime dimensions, but formulate our results in a manner applicable to higher spacetime dimensions. The twisted self-duality conditions are redundant and we exhibit a non-redundant subset of conditions, which have the remarkable property to involve only first-order derivatives with respect to time. This non-redundant subset equates the electric field of the spin-$s$ field (which we define) to the magnetic field of its dual (which we also define), and vice versa. The non-redundant subset of twisted self-duality conditions involve the purely spatial components of the spin-$s$ field and its dual, and also the components of the fields with one zero index. One can get rid of these gauge components by taking the curl of the equations, which does not change their physical content. In this form, the twisted self-duality conditions can be derived from a variational principle that involves prepotentials, which are the higher spin generalizations of the prepotentials previously found in the spins 2 and 3 cases. The prepotentials have again the intriguing feature of possessing both higher spin diffeomorphism invariance and higher spin conformal geometry. The tools introduced in an earlier paper for handling higher spin conformal geometry turn out to be crucial for streamlining the analysis. In four spacetime dimensions where the electric and magnetic fields are tensor fields of the same type, the twisted self-duality conditions enjoy an $SO(2)$ electric-magnetic invariance. We explicitly show that this symmetry is an "off-shell symmetry" (i.e., a symmetry of the action and not just of the equations of motion). Remarks on the extension to higher dimensions are given.

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