Abstract
The Bondi–Metzner–Sachs (BMS) group is an infinite-dimensional symmetry group of asymptotically flat gravity at null infinity, that extends Poincaré symmetry.
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Notes
- 1.
We are cheating in (9.8), since for now there is no way to distinguish \(X'''(\varphi )\) from \(-X'(\varphi )\); the justification for this combination of derivatives will be provided by asymptotic symmetries.
- 2.
The prefix “super” has nothing to do with supersymmetry, but stresses the fact that special-relativistic quantities are extended in an infinite-dimensional way.
- 3.
Indeed, changing the normalization of p would also change the value of the central charge that ensures that the bracket \(\{{\mathcal J},{\mathcal P}\}\) takes the canonical form in Eq. (9.37).
- 4.
In case of identical notations, the subscript indicates which group we are referring to.
- 5.
As in Chap. 6 we describe diffeomorphisms of the circle by their lifts belonging to the universal cover \(\widetilde{\text {Diff}}{}^+(S^1)\), which we abusively denote simply as \(\text {Diff}(S^1)\).
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Oblak, B. (2017). Classical BMS\(_3\) Symmetry. In: BMS Particles in Three Dimensions. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-61878-4_9
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