Abstract
Abstract
How does one compute the Bondi mass on an arbitrary cut of null infinity
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when it is not presented in a Bondi system? What then is the correct definition of the mass aspect? How does one normalise an asymptotic translation computed on a cut which is not equipped with the unit-sphere metric? These are questions which need to be answered if one wants to calculate the Bondi–Sachs energy–momentum for a space-time which has been determined numerically. Under such conditions there is not much control over the presentation of
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so that most of the available formulations of the Bondi energy–momentum simply do not apply. The purpose of this article is to provide the necessary background for a manifestly conformally invariant and gauge independent formulation of the Bondi energy–momentum. To this end we introduce a conformally invariant version of the GHP formalism to rephrase all the well-known formulae. This leads us to natural definitions for the space of asymptotic translations with its Lorentzian metric, for the Bondi news and the mass-aspect. A major role in these developments is played by the ‘co-curvature’, a naturally appearing quantity closely related to the Gauß curvature on a cut of
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.
Funder
Royal Society Te Apārangi
Subject
Physics and Astronomy (miscellaneous)
Cited by
5 articles.
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