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Symplectic geometry of null infinity and two-surface twistors

W T Shaw

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LETTER TO THE EDITOR

The symplectic approach to obtaining fluxes of gravitational energy-momentum and angular momentum given by Ashtekar and Streubel (1981) is completed by giving explicit expressions for the charge integral associated with an arbitrary BMS vector at a given retarded time. The expressions are obtained by weakening the definition of angular momentum given by Penrose (1982) into a map dual to the entire BMS group.


PACS

04.20.-q Classical general relativity

MSC

83C40 Gravitational energy and conservation laws; groups of motions

Subjects

Gravitation and cosmology

Dates

Issue 4 (July 1984)



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