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arXiv 2202.12129hep-thgr-qc
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二维和三维引力因果边界的对称性

Symmetries at Causal Boundaries in 2D and 3D Gravity

H. Adami, Pujian Mao, M. M. Sheikh-Jabbari, V. Taghiloo, H. Yavartanoo

摘要:

我们研究二维和三维引力理论的时空因果(类时或空)余维一个边界,同时允许边界的位置变化。我们构造相应的解决方案相空间和指定的边界自由度,通过分析边界(表面)电荷标记它们。讨论了解空间中的Y自由度和W自由度以及切片的变化。对于D维的情况下,我们发现D+1表面电荷,这是通用的功能,在因果边界。我们证明了存在解空间切片,其中的电荷是可积的。对于3d情形,存在一个可积切片,其中电荷代数的形式为Heisenberg \oplus \ { \cal A}_3,其中{ \cal A}_3是Virasoro在Brown-Henneaux中心荷(AdS_3引力)和BMS_3(3d平坦空间引力)的两个拷贝.

英文摘要:

We study 2d and 3d gravity theories on spacetimes with causal (timelike or null) codimension one boundaries while allowing for variations in the position of the boundary. We construct the corresponding solution phase space and specify boundary degrees freedom by analysing boundary (surface) charges labelling them. We discuss Y and W freedoms and change of slicing in the solution space. For D dimensional case we find D+1 surface charges, which are generic functions over the causal boundary. We show that there exist solution space slicings in which the charges are integrable. For the 3d case there exists an integrable slicing where charge algebra takes the form of Heisenberg \oplus\ {\cal A}_3 where {\cal A}_3 is two copies of Virasoro at Brown-Henneaux central charge for AdS_3 gravity and BMS_3 for the 3d flat space gravity.

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