奇异大质量引力：因果关系和Birkhoff类定理
Exotic Massive Gravity: Causality and a Birkhoff-like Theorem
摘要：
本文通过Shapiro时滞计算研究了三维壳层上一致奇异质量引力的局域因果性问题。该理论显示了时间延迟，而不是时间推进，尽管在线性化水平上有一个鬼都渐近平坦和反德西特时空。我们还证明了Birkhoff定理：任何具有超曲面正交非零Killing向量场的解都是共形平坦的，并找到了一些精确解。
英文摘要：
We study the local causality issue via the Shapiro time-delay computations in the on-shell consistent exotic massive gravity in three dimensions. The theory shows time-delay as opposed to time-advance despite having a ghost at the linearized level both for asymptotically flat and anti-de Sitter spacetimes. We also prove a Birkhoff-like theorem: any solution with a hypersurface orthogonal non-null Killing vector field is conformally flat; and find some exact solutions.
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