# Estimating energy-momentum and angular momentum near null infinity

## Abstract

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.

- Authors:

- Department of Mathematics, University of Missouri, Columbia, Missouri 65211 (United States)

- Publication Date:

- OSTI Identifier:
- 21431045

- Resource Type:
- Journal Article

- Resource Relation:
- Journal Name: Physical Review. D, Particles Fields; Journal Volume: 81; Journal Issue: 8; Other Information: DOI: 10.1103/PhysRevD.81.084001; (c) 2010 The American Physical Society

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ANGULAR MOMENTUM; APPROXIMATIONS; GAUGE INVARIANCE; SPHERICAL CONFIGURATION; SURFACES; TOPOLOGY; CALCULATION METHODS; CONFIGURATION; INVARIANCE PRINCIPLES; MATHEMATICS

### Citation Formats

```
Helfer, Adam D.
```*Estimating energy-momentum and angular momentum near null infinity*. United States: N. p., 2010.
Web. doi:10.1103/PHYSREVD.81.084001.

```
Helfer, Adam D.
```*Estimating energy-momentum and angular momentum near null infinity*. United States. doi:10.1103/PHYSREVD.81.084001.

```
Helfer, Adam D. Thu .
"Estimating energy-momentum and angular momentum near null infinity". United States. doi:10.1103/PHYSREVD.81.084001.
```

```
@article{osti_21431045,
```

title = {Estimating energy-momentum and angular momentum near null infinity},

author = {Helfer, Adam D.},

abstractNote = {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.},

doi = {10.1103/PHYSREVD.81.084001},

journal = {Physical Review. D, Particles Fields},

number = 8,

volume = 81,

place = {United States},

year = {Thu Apr 15 00:00:00 EDT 2010},

month = {Thu Apr 15 00:00:00 EDT 2010}

}

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