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arXiv 1106.4657hep-thgr-qc
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共形引力与临界引力的推广

Conformal Gravity and Extensions of Critical Gravity

H. Lu, Yi Pang, C. N. Pope

摘要:

涉及保角不变Weyl平方作用量的高阶曲率修正在最近两次四维引力研究中起了作用;在临界引力中,它被添加到标准的宇宙学爱因斯坦-希尔伯特作用量中,并调整系数,使大质量幽灵般的自旋-2激发无质量,而在马尔达塞纳考虑的纯外尔平方作用量中,其中通过施加边界条件来去除大质量自旋-2模式。我们展示了这两种方法之间的联系,我们还概括了临界重力更广泛的类外尔平方修改宇宙爱因斯坦引力,可以消除大量的幽灵般的自旋2模式的边界条件。宇宙学常数在讨论中起着至关重要的作用,因为在AdS_4周围有一个非快子的负质量平方自旋2模式的“窗口”。我们还构建了类似的共形和非共形重力在六个维度。

英文摘要:

Higher-order curvature corrections involving the conformally-invariant Weyl-squared action have played a role in two recent investigations of four-dimensional gravity; in critical gravity, where it is added to the standard cosmological Einstein-Hilbert action with a coefficient tuned to make the massive ghostlike spin-2 excitations massless, and in a pure Weyl-squared action considered by Maldacena, where the massive spin-2 modes are removed by the imposition of boundary conditions. We exhibit the connections between the two approaches, and we also generalise critical gravity to a wider class of Weyl-squared modifications to cosmological Einstein gravity where one can eliminate the massive ghostlike spin-2 modes by means of boundary conditions. The cosmological constant plays a crucial role in the discussion, since there is then a "window" of negative mass-squared spin-2 modes around AdS_4 that are not tachyonic. We also construct analogous conformal and non-conformal gravities in six dimensions.

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