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Estimating Energy-Momentum and Angular Momentum Near Null Infinity

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arxiv 0907.3461 v2 pith:MZJDUJQB submitted 2009-07-20 gr-qc

Adam D. Helfer This is my paper · ORCID
classification gr-qc
keywords angularenergy-momentummomentuminfinitynulltwo-surfaceapplicableapproximate
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The energy-momentum and angular momentum contained in a spacelike two-surface of spherical topology are estimated by joining the two-surface to null infinity via an approximate no-incoming-radiation condition. The result is a set of gauge-invariant formulas for energy-momentum and angular momentum which should be applicable to much numerical work; it also gives estimates of the finite-size effects.

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  1. Conformal compactification and affine-null metric formulation of the Einstein equations

    gr-qc 2025-04 conditional novelty 6.0 of 10

    A hierarchical, boundary-regular affine-null form of the conformal Einstein-scalar equations is derived, shown equivalent to compactified physical-space equations, and used to extract the news function at null infinity.

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