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arXiv 1702.07079hep-th
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量子场论中的外尔不变性与共形不变性

Weyl versus Conformal Invariance in Quantum Field Theory

Kara Farnsworth, Markus A. Luty, Valentina Prilepina

摘要:

我们认为,在平坦时空的共形不变性意味着外尔不变性在一般弯曲的背景度规的时空维度$d \leq 10$的所有酉理论。我们还研究了可能的曲率修正的外尔变换的运营商,并表明,这些都没有足够低的维度和自旋的运营商。我们发现可能的“异常”外尔变换成正比的外尔(棉花)张量$d > 3$($d = 3$)。参数是基于代数一致性条件类似的Wess-Zumino一致性条件,分类可能的本地异常。这些参数可以直接扩展到更大的算子维数和更高的$d$,并具有额外的代数复杂性。

英文摘要:

We argue that conformal invariance in flat spacetime implies Weyl invariance in a general curved background metric for all unitary theories in spacetime dimensions $d \leq 10$. We also study possible curvature corrections to the Weyl transformations of operators, and show that these are absent for operators of sufficiently low dimensionality and spin. We find possible `anomalous' Weyl transformations proportional to the Weyl (Cotton) tensor for $d > 3$ ($d = 3$). The arguments are based on algebraic consistency conditions similar to the Wess-Zumino consistency conditions that classify possible local anomalies. The arguments can be straightforwardly extended to larger operator dimensions and higher $d$ with additional algebraic complexity.

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