par Compère, Geoffrey 
;Gralla, Samuel E.;Wei, Hongji
Référence Classical and quantum gravity, 40, 20, 205018
Publication Publié, 2023-10-01
;Gralla, Samuel E.;Wei, HongjiRéférence Classical and quantum gravity, 40, 20, 205018
Publication Publié, 2023-10-01
Article révisé par les pairs
| Résumé : | Asymptotically flat spacetimes have been studied in five separate regions: future/past timelike infinity i ± , future/past null infinity , and spatial infinity i 0. We formulate assumptions and definitions such that the five infinities share a single Bondi-Metzner-Sachs (BMS) group of asymptotic symmetries and associated charges. We show how individual ingoing/outgoing massive bodies may be ascribed initial/final BMS charges and derive global conservation laws stating that the change in total charge is balanced by the corresponding radiative flux. This framework provides a foundation for the study of asymptotically flat spacetimes containing ingoing and outgoing massive bodies, i.e. for generalized gravitational scattering. Among the new implications are rigorous definitions for quantities like initial/final spin, scattering angle, and impact parameter in multi-body spacetimes, without the use of any preferred background structure. |
