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arXiv 1504.01653hep-thgr-qc
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Wald熵与6维共形anomaly

The Wald entropy and 6d conformal anomaly

Amin Faraji Astaneh, Sergey N. Solodukhin

摘要:

我们分析了Wald熵的不同形式的共形异常在六个维度。特别是,我们专注于在亨宁森和Skenderis全息计算中出现的异常。异常的各种表示因某些全导数项而不同。我们计算相应的Wald熵的表面不具有阿贝尔$O(2)$对称性的横向方向,虽然外在曲率消失。我们证明了这类曲面的Wald熵是不同形式的共形异常。这种差异是由于异常中存在的总导数项造成的。我们分析了全息共形异常的Wald熵的共形不变性,并证明了不变性的破坏是由于异常中的总导数项的贡献。最后,我们给出了Hung-Myers-Smolkin不等式的更精确的一般形式。

英文摘要:

We analyze the Wald entropy for different forms of the conformal anomaly in six dimensions. In particular we focus on the anomaly which arises in a holographic calculation of Henningson and Skenderis. The various presentations of the anomaly differ by some total derivative terms. We calculate the corresponding Wald entropy for surfaces which do not have an Abelian $O(2)$ symmetry in the transverse direction although the extrinsic curvature vanishes. We demonstrate that for this class of surfaces the Wald entropy is different for different forms of the conformal anomaly. The difference is due to the total derivative terms which are present in the anomaly. We analyze the conformal invariance of the Wald entropy for the holographic conformal anomaly and demonstrate that the violation of the invariance is due to the contributions of the total derivative terms in the anomaly. Finally, we make more precise general form of the Hung-Myers-Smolkin discrepancy.

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