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arXiv 1509.08511hep-th
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异常、共形流形和球面

Anomalies, Conformal Manifolds, and Spheres

Jaume Gomis, Po-Shen Hsin, Zohar Komargodski, Adam Schwimmer, Nathan Seiberg, Stefan Theisen

摘要:

精确边缘算子的两点函数导致对偶数维迹异常的普遍贡献。我们研究了这种迹线异常的各个方面,强调其作为西格玛模型的解释,其目标空间M是共形场论(a.k.a.共形流形)。当基础的量子场论是超对称的时,这个西格玛模型必须被适当地超对称化。作为例子,我们考虑在一些细节N=(2,2)和N=(0,2)超对称理论在d=2和N=2超对称理论在d=4。这种推理导致新的信息,这些理论的共形流形,例如,我们表明,流形是Kahler-Hodge,我们进一步认为,它有消失的Kahler类。对于d=2的N=(2,2)理论和d=4的N=2理论,我们还证明了球配分函数和M的Kahler势之间的关系可以直接从我们构造的适当的西格玛模型得出。在此过程中,我们发现了几个潜在的跟踪异常的例子,遵守Wess-Zumino一致性条件,但可以排除更详细的分析。

英文摘要:

The two-point function of exactly marginal operators leads to a universal contribution to the trace anomaly in even dimensions. We study aspects of this trace anomaly, emphasizing its interpretation as a sigma model, whose target space M is the space of conformal field theories (a.k.a. the conformal manifold). When the underlying quantum field theory is supersymmetric, this sigma model has to be appropriately supersymmetrized. As examples, we consider in some detail N=(2,2) and N=(0,2) supersymmetric theories in d=2 and N=2 supersymmetric theories in d=4. This reasoning leads to new information about the conformal manifolds of these theories, for example, we show that the manifold is Kahler-Hodge and we further argue that it has vanishing Kahler class. For N=(2,2) theories in d=2 and N=2 theories in d=4 we also show that the relation between the sphere partition function and the Kahler potential of M follows immediately from the appropriate sigma models that we construct. Along the way we find several examples of potential trace anomalies that obey the Wess-Zumino consistency conditions, but can be ruled out by a more detailed analysis.

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