From conformal to Einstein gravity

From conformal to Einstein gravity
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从共形到爱因斯坦引力

DOI:
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发表时间:
2016
期刊:
影响因子:
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通讯作者:
R. Olea
R. Olea
中科院分区:
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文献类型:
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作者:
Giorgos Anastasiou;R. Olea

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我们利用 Maldacena 给出的诺依曼边界条件,对爱因斯坦和共形引力 (CG) 之间的等价性进行了简单推导。由于爱因斯坦时空是巴赫平坦的,因此 CG 的通用解决方案将包含爱因斯坦和非爱因斯坦部分。使用韦尔张量中时空曲率的这种分解,可以表明两种理论在作用及其变化层面上的等价性。因此,我们证明了四个维度中临界重力的壳上作用是根据巴赫张量唯一给出的。
We provide a simple derivation of the equivalence between Einstein and Conformal Gravity (CG) with Neumann boundary conditions given by Maldacena. As Einstein spacetimes are Bach flat, a generic solution to CG would contain both Einstein and non-Einstein part. Using this decomposition of the spacetime curvature in the Weyl tensor, makes manifest the equivalence between the two theories, both at the level of the action and the variation of it. As a consequence, we show that the on-shell action for Critical Gravity in four dimensions is given uniquely in terms of the Bach tensor.