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arXiv 1609.09514hep-thgr-qc
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共形引力SO(1,5)延拓中的非线性部分无质量对称性

Non-linear partially massless symmetry in an SO(1,5) continuation of conformal gravity

Luis Apolo, S. F. Hassan

摘要:

我们构造了一个非线性的相互作用自旋2场的理论,该理论在部分无质量(PM)对称性下对所有阶数都是不变的。这个理论基于SO(1,5)群,类似于共形引力的SO(2,4)公式,但具有无鬼不稳定性的二次谱。作用量包含一个与局部SO(2)对称性相关的矢量场,这在该理论的Vielbein公式中很明显。我们证明,在微扰展开中,SO(2)对称性转化为大质量自旋2场的PM变换。在这种情况下,矢量场是至关重要的,以规避早期的障碍,以一个订单的PM对称性的建设。虽然非线性理论缺乏足够的第一类约束,以消除所有的螺旋度为0的模式从频谱中,PM转换生存的所有订单。这里没有讨论非线性水平上不存在重影和强耦合效应的问题。

英文摘要:

We construct a non-linear theory of interacting spin-2 fields that is invariant under the partially massless (PM) symmetry to all orders. This theory is based on the SO(1,5) group, in analogy with the SO(2,4) formulation of conformal gravity, but has a quadratic spectrum free of ghost instabilities. The action contains a vector field associated to a local SO(2) symmetry which is manifest in the vielbein formulation of the theory. We show that, in a perturbative expansion, the SO(2) symmetry transmutes into the PM transformations of a massive spin-2 field. In this context, the vector field is crucial to circumvent earlier obstructions to an order-by-order construction of PM symmetry. Although the non-linear theory lacks enough first class constraints to remove all helicity-0 modes from the spectrum, the PM transformations survive to all orders. The absence of ghosts and strong coupling effects at the non-linear level are not addressed here.

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