The Wald-Zoupas prescription for asymptotic charges at null infinity in general relativity. (English) Zbl 1495.83015
Summary: We use the formalism developed by R. M. Wald and A. Zoupas [Phys. Rev. D (3) 61, No. 8, 084027, 16 pp. (2000; Zbl 1136.83317)] to derive explicit covariant expressions for the charges and fluxes associated with the Bondi-Metzner-Sachs symmetries at null infinity in asymptotically flat spacetimes in vacuum general relativity. Our expressions hold in non-stationary regions of null infinity, are local and covariant, conformally-invariant, and are independent of the choice of foliation of null infinity and of the chosen extension of the symmetries away from null infinity. While similar expressions have appeared previously in the literature in Bondi-Sachs coordinates (to which we compare our own), such a choice of coordinates obscures these properties. Our covariant expressions can be used to obtain charge formulae in any choice of coordinates at null infinity. We also include detailed comparisons with other expressions for the charges and fluxes that have appeared in the literature: the Ashtekar-Streubel flux formula, the Komar formulae, and the linkage and twistor charge formulae. Such comparisons are easier to perform using our explicit expressions, instead of those which appear in the original work by Wald and Zoupas.
MSC:
| 83C30 | Asymptotic procedures (radiation, news functions, \(\mathcal{H} \)-spaces, etc.) in general relativity and gravitational theory |
| 83C50 | Electromagnetic fields in general relativity and gravitational theory |
| 78A35 | Motion of charged particles |
| 22E70 | Applications of Lie groups to the sciences; explicit representations |
| 53C18 | Conformal structures on manifolds |
| 53C12 | Foliations (differential geometric aspects) |
Citations:
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