Linking Past and Future Null Infinity in Three Dimensions
arXiv:1701.06573 · doi:10.1103/PhysRevD.95.086011
Abstract
We provide a mapping between past null and future null infinity in three-dimensional flat space, using symmetry considerations. From this we derive a mapping between the corresponding asymptotic symmetry groups. By studying the metric at asymptotic regions, we find that the mapping is energy preserving and yields an infinite number of conservation laws.
7 pages, 3 figures; added references and appendix, matches published version
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