Uniqueness of the Trautman--Bondi mass

Details Uniqueness of the Trautman--Bondi mass Uniqueness of the Trautman--Bondi mass

1998-03-02

arxiv.org/abs/gr-qc/9803010v1

Phys.Rev.D58:084001,1998

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

latex, 33 pages

Scientific paper

10.1103/PhysRevD.58.084001

It is shown that the only functionals, within a natural class, which are monotonic in time for all solutions of the vacuum Einstein equations admitting a smooth ``piece'' of conformal null infinity Scri, are those depending on the metric only through a specific combination of the Bondi `mass aspect' and other next--to--leading order terms in the metric. Under the extra condition of passive BMS invariance, the unique such functional (up to a multiplicative factor) is the Trautman--Bondi energy. It is also shown that this energy remains well-defined for a wide class of `polyhomogeneous' metrics.

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