IFEG   20353
INSTITUTO DE FISICA ENRIQUE GAVIOLA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
General notion of total intrinsic angular momentum in general relativity
Autor/es:
EMANUEL GALLO; MORESCHI OSVALDO
Lugar:
VARSOVIA
Reunión:
Conferencia; GR20; 2013
Institución organizadora:
INTERNATIONAL SOCIETY OF GENERAL RELATIVITY AND GRAVITATION
Resumen:
The notion of total angular momentum at future null infinity has been the subject
of numerous works.
Different author have employed a variety of approaches that yielded nonequivalent definitions.
In the case of a spacetime with axial symmetry due to the conservation property
of Komar integrals, it is tempting to use as the appropriate notion of total
angular momentum at future null infinity. But in a realistic situation the spacetime
will not have any symmetries and the problem remains.
Almost all of the suggested definitions, for the general case, suffer from the so
called problem of supertranslations. However one of the authors was able to provide
with a definition of intrinsic angular momentum which have circumvented those problems
and also provided at the same time with the notion of center of mass at future
null infinity. This approach was based on the notion of charge integrals of the
Riemann tensor.
In this work we present the most general notion of intrinsic angular momentum,
based on charge integrals approach, that is suitable for radiating spacetimes and do not
suffer from supertranslations ambiguities.
We also present the implications in requiring explicit agreement with the
Komar integrals in the case of axial symmetry.