Estimating total momentum at finite distances

Details Estimating total momentum at finite distances Estimating total momentum at finite distances

2008-06-26

arxiv.org/abs/0806.4340v2

Phys.Rev.D78:084027,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

10 pages, 1 figure. Typos corrected. Comments added and a new Appendix. To be published in PRD

Scientific paper

10.1103/PhysRevD.78.084027

We study the difficulties associated with the evaluation of the total Bondi momentum at finite distances around the central source of a general (asymptotically flat) spacetime. Since the total momentum is only rigorously defined at future null infinity, both finite distance and gauge effects must be taken into account for a correct computation of this quantity. Our discussion is applicable in general contexts but is particularly relevant in numerically constructed spacetimes for both extracting important physical information and assessing the accuracy of additional quantities.

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