## Abstract

Logarithmic ambiguities in the choice of asymptotically Cartesian coordinates at spatial infinity are discussed. It is shown that they do not affect the definitions of energy-momentum and angular momentum at i°. Thus, from a physical viewpoint, the ambiguities are "pure gauge." A prescription is given for fixed this gauge freedom for the class of space-times in which the leading-order part of the Weyl tensor satisfies a certain reflection symmetry. This class admits, in all (relatively boosted) rest frames at infinity, a one-parameter family of asymptotically distinct 3-surfaces (generalized 3-planes) on which the trace of the extrinsic curvature falls off faster than usual.

Original language | English (US) |
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Pages (from-to) | 419-431 |

Number of pages | 13 |

Journal | Foundations of Physics |

Volume | 15 |

Issue number | 4 |

DOIs | |

State | Published - Apr 1 1985 |

## All Science Journal Classification (ASJC) codes

- Physics and Astronomy(all)