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arXiv 1307.6567hep-th
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弯曲空间上的超对称性和超共形异常

Supersymmetry on curved spaces and superconformal anomalies

Davide Cassani, Dario Martelli

摘要:

我们研究了四维场论在弯曲流形上的刚性超对称性的结果。我们表明,在洛伦兹签名的背景矢量场耦合到R-电流是由外尔张量的背景度量。在欧几里德签名中,如果两个具有相反R-电荷的超荷保持不变,则同样成立,否则矢量场强的(反)自对偶部分由外尔张量固定。由于这种关系,超共形场论的迹线和R流反常被简化,迹线反常变成纯拓扑的。特别是,在洛伦兹签名,或在存在两个欧几里德超电荷的相反的R-电荷,超对称的背景意味着,在跟踪和R-电流异常的中心荷c成比例的条款消失。这等价于超空间外尔不变量的消失。我们评论的影响,我们的结果全息。

英文摘要:

We study the consequences of unbroken rigid supersymmetry of four-dimensional field theories placed on curved manifolds. We show that in Lorentzian signature the background vector field coupling to the R-current is determined by the Weyl tensor of the background metric. In Euclidean signature, the same holds if two supercharges of opposite R-charge are preserved, otherwise the (anti-)self-dual part of the vector field-strength is fixed by the Weyl tensor. As a result of this relation, the trace and R-current anomalies of superconformal field theories simplify, with the trace anomaly becoming purely topological. In particular, in Lorentzian signature, or in the presence of two Euclidean supercharges of opposite R-charge, supersymmetry of the background implies that the term proportional to the central charge c vanishes, both in the trace and R-current anomalies. This is equivalent to the vanishing of a superspace Weyl invariant. We comment on the implications of our results for holography.

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