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arXiv 2004.13041hep-th
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高自旋方程的对合系统

The Involutive System of Higher-Spin Equations

Rakibur Rahman

摘要:

我们重新讨论了高自旋场在非平凡背景中的一致自由传播问题,重点是对称张量(-旋量)。在平坦空间中,有质量场的Fierz-Pauli方程形成一个对合系统,其代数一致性归因于一定的规范恒等式。前者的零质量极限直接导致横观无迹规范中的无质量高自旋方程,其中场和规范参数都有各自的对合系统和规范恒等式。在非平凡背景下,正是这些规范恒等式和对称性的保持,确保了传播自由度的正确数量。通过这种方法,我们找到了某些引力/电磁背景中有质量和无质量的高自旋玻色子和费米子的一致方程组。我们还提出了部分无质量场的对合系统,并给出了它们的规范变换的显式形式。研究了平坦空间中对称张量(-旋量)s上算子的李超代数,证明了在AdS空间中该代数是非线性闭的,并且需要一个中心扩张。

英文摘要:

We revisit the problem of consistent free propagation of higher-spin fields in nontrivial backgrounds, focusing on symmetric tensor(-spinor)s. The Fierz-Pauli equations for massive fields in flat space form an involutive system, whose algebraic consistency owes to certain gauge identities. The zero mass limit of the former leads directly to massless higher-spin equations in the transverse-traceless gauge, where both the field and the gauge parameter have their respective involutive systems and gauge identities. In nontrivial backgrounds, it is the preservation of these gauge identities and symmetries that ensures the correct number of propagating degrees of freedom. With this approach we find consistent sets of equations for massive and massless higher-spin bosons and fermions in certain gravitational/electromagnetic backgrounds. We also present the involutive system of partially massless fields, and give an explicit form of their gauge transformations. We consider the Lie superalgebra of the operators on symmetric tensor(-spinor)s in flat space, and show that in AdS space the algebra closes nonlinearly and requires a central extension.

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