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arXiv 1910.00520gr-qchep-th
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空间无穷远渐近共形对称性

Asymptotic conformal symmetry at spatial infinity

Sepideh Bakhoda, Fatemeh Mahdieh, Hossein Shojaie

摘要:

本文研究了在渐近共形平坦时空的渐近对称群中加入空间共形对称的效应。结果表明,除了BMS组,只有膨胀的空间共形生成元保持相应的边界条件下的超曲面变形共形不变。我们证明了,为了获得(i)一个定义明确的辛结构和(ii)一个有限的和(iii)可积的保守电荷,这些条件同时满足时,承认Regge-Teitelboim和扭曲Henneaux-Troessaert宇称条件,后者也包含超平移不变性。守恒膨胀电荷包含非零项,与场变量无关,在边界上产生非零效应。膨胀对称也改变了ADM质量,这是共形对称的另一个物理效应。

英文摘要:

In this paper, the effects of adding spatial conformal symmetry to the asymptotic symmetry group of an asymptotically conformally flat spacetime are studied. It is shown that, in addition to the BMS group, only the dilations of the spatial conformal generators keep the corresponding boundary conditions conformally invariant under hypersurface deformations. We prove that in order to attain (i) a well-defined symplectic structure and (ii) a finite and (iii) integrable conserved charge, these conditions are satisfied simultaneously when admitting Regge-Teitelboim and twisted Henneaux-Troessaert parity conditions, where the latter also contain supertranslation invariance. The conserved dilation charge contains nonzero terms independent of the field variables, giving a nonvanishing effect on the boundary. The dilation symmetry also modifies the ADM mass, which is another physical effect of the conformal symmetry.

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