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arXiv 1503.08143hep-th
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关于高自旋配分函数

On higher spin partition functions

M. Beccaria, A. A. Tseytlin

摘要:

我们观察到所有无质量高自旋s= 0,1,2,3,.的集合的配分函数。在平坦空间中等于1:虚行列式与“物理”行列式抵消,或者等价地,(正则化的)自由度总数为零。这反映了大的潜在的规范对称性,并建议与超对称或拓扑理论的类比。Z=1的性质也延伸到AdS的背景,即瓦西里耶夫理论的1-loop真空配分函数等于1(假设自旋上的和的特定正则化);这在之前被注意到作为向量AdS/CFT对偶的一致性要求。我们发现Z=1也适用于在平坦或共形平坦的S^4背景附近展开的共形高自旋理论(具有高导数的d^{2s}动力学项)。在平坦的四维空间中,我们还考虑了具有2-导数动力学项但只有标量规范不变性的对称无迹秩s张量场的自由共形理论的配分函数。这种非幺正理论在弯曲背景下具有Weyl不变量作用,对应于AdS_5中的“部分无质量”场。我们详细讨论了s=2(或“共形引力子”)的特殊情况,计算了相应的共形反常系数,并将它们与以前发现的四维共形群的一般表示的表达式进行了比较。

英文摘要:

We observe that the partition function of the set of all free massless higher spins s=0,1,2,3,... in flat space is equal to one: the ghost determinants cancel against the "physical" ones or, equivalently, the (regularized) total number of degrees of freedom vanishes. This reflects large underlying gauge symmetry and suggests analogy with supersymmetric or topological theory. The Z=1 property extends also to the AdS background, i.e. the 1-loop vacuum partition function of Vasiliev theory is equal to 1 (assuming a particular regularization of the sum over spins); this was noticed earlier as a consistency requirement for the vectorial AdS/CFT duality. We find that Z=1 is also true in the conformal higher spin theory (with higher-derivative d^{2s} kinetic terms) expanded near flat or conformally flat S^4 background. We also consider the partition function of free conformal theory of symmetric traceless rank s tensor field which has 2-derivative kinetic term but only scalar gauge invariance in flat 4d space. This non-unitary theory has a Weyl-invariant action in curved background and corresponds to "partially massless" field in AdS_5. We discuss in detail the special case of s=2 (or "conformal graviton"), compute the corresponding conformal anomaly coefficients and compare them with previously found expressions for generic representations of conformal group in 4 dimensions.

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