Phys. Rev. D 48, R2373–R2376 (1993)Gravitational observables and local symmetries
Using a recent classification of local symmetries of the vacuum Einstein equations, it is shown that there can be no observables for the vacuum gravitational field (in a closed universe) built as spatial integrals of local functions of Cauchy data and their derivatives. © 1993 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.48.R2373
DOI:
10.1103/PhysRevD.48.R2373
PACS:
04.20.Cv, 04.20.Me, 04.60.+n
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