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arXiv 1102.2219hep-th
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Vasiliev四维高自旋引力的action原理

An action principle for Vasiliev's four-dimensional higher-spin gravity

Nicolas Boulanger, Per Sundell

摘要:

我们给出了四维时空中玻色规范场的Vasiliev完全非线性运动方程和作用量原理。我们首先扩展Vasiliev的原始系统的微分形式的程度高于一。然后,我们推导出由此产生的对偶扩展的运动方程的变分原理的基础上的广义Hamilton σ模型的行动。广义哈密顿量包含两种类型的相互作用自由度:一组函数出现在对偶扩张系统中奇形式的广义曲率的Q-结构中;另一组依赖于拉格朗日乘子,编码广义泊松结构,即目标空间中秩为2或更高的多向量场的集合。我们发现,至少有一组相互作用自由函数必须是线性的,以确保规范不变性。我们讨论一致截断的最小型A和B模型(只有偶数自旋),频谱流壳上,并提供边界条件的领域和规范参数是兼容的变分原理,使对偶扩展系统等效,壳上,瓦西里耶夫的原始系统。

英文摘要:

We provide Vasiliev's fully nonlinear equations of motion for bosonic gauge fields in four spacetime dimensions with an action principle. We first extend Vasiliev's original system with differential forms in degrees higher than one. We then derive the resulting duality-extended equations of motion from a variational principle based on a generalized Hamiltonian sigma-model action. The generalized Hamiltonian contains two types of interaction freedoms: One set of functions that appears in the Q-structure of the generalized curvatures of the odd forms in the duality-extended system; and another set depending on the Lagrange multipliers, encoding a generalized Poisson structure, i.e. a set of polyvector fields of ranks two or higher in target space. We find that at least one of the two sets of interaction-freedom functions must be linear in order to ensure gauge invariance. We discuss consistent truncations to the minimal Type A and B models (with only even spins), spectral flows on-shell and provide boundary conditions on fields and gauge parameters that are compatible with the variational principle and that make the duality-extended system equivalent, on shell, to Vasiliev's original system.

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