IFEG   20353
INSTITUTO DE FISICA ENRIQUE GAVIOLA
Unidad Ejecutora - UE
artículos
Título:
On the Physical Interpretation of Asymptotically Flat Gravitational Fields
Autor/es:
CARLOS KOZAMEH, EZRA T. NEWMAN, GILBERTO SILVA-ORTIGOZA
Revista:
GENERAL RELATIVITY AND GRAVITATION
Editorial:
Springer-Verlag
Referencias:
Lugar: Berlin; Año: 2008 vol. 40 p. 2043 - 2050
ISSN:
0001-7701
Resumen:
A problem in general relativity is how to extract physical information from solu- tions to the Einstein equations. Most often information is found from special condi- tions, e.g., special vector .elds, symmetries or approximate symmetries. Our concern is with asymptotically .at space-times with approximate symmetry: the BMS group. For these spaces the Bondi four-momentum vector and its evolution, found at in.n- ity, describes the total energy-momentum and the energy-momentum radiated. By generalizing the simple idea of the transformation of (electromagnetic) dipoles under a translation, we de.ne (analogous to center of charge) the center of mass for asymp- totically .at Einstein-Maxwell .elds. This gives kinematical meaning to the Bondi four-momentum, i.e., the four-momentum and its evolution is described in terms of a center of mass position vector, its velocity and spin-vector. From dynamical ar- guments, a unique (for our approximation) total angular momentum and evolution equation in the form of a conservation law is found.