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arXiv 1707.00341hep-thgr-qc
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临界引力中的Noether-Wald能量

Noether-Wald energy in Critical Gravity

Giorgos Anastasiou, Rodrigo Olea, David Rivera-Betancour

摘要:

临界性表示高导数引力理论的参数空间中的特定点,在此线性化的场方程退化。在四维临界引力中,拉格朗日量包含一个外尔平方项,它不会修改曲率的渐近形式。选择Weyl $^{2}$耦合,使其消除大量标量模式,并使大量自旋2模式无质量。这样,理论在临界点附近变得一致。在这里,我们采用诺特-瓦尔德方法来推导临界引力作用的守恒量。从这个能量定义可以看出,在临界点,爱因斯坦时空的质量为零,这是理论的一个定义性质。由于熵是从视界处的诺特-瓦尔德荷得到的,很明显,对于任何爱因斯坦黑洞,熵也为零。

英文摘要:

Criticality represents a specific point in the parameter space of a higher-derivative gravity theory, where the linearized field equations become degenerate. In 4D Critical Gravity, the Lagrangian contains a Weyl-squared term, which does not modify the asymptotic form of the curvature. The Weyl$^{2}$ coupling is chosen such that it eliminates the massive scalar mode and it renders the massive spin-2 mode massless. In doing so, the theory turns consistent around the critical point. Here, we employ the Noether-Wald method to derive the conserved quantities for the action of Critical Gravity. It is manifest from this energy definition that, at the critical point, the mass is identically zero for Einstein spacetimes, what is a defining property of the theory. As the entropy is obtained from the Noether-Wald charges at the horizon, it is evident that it also vanishes for any Einstein black hole.

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