Phys. Rev. Lett. 78, 783–786 (1997)Very Simple Proof of the Causal Propagation of Gravity in VacuumReceived 10 October 1996; published in the issue dated 3 February 1997 In this Letter we present a new property of the Bel-Robinson tensor which allows us to give a very simple proof of the causal propagation of gravity in vacuum and that, moreover, provides an invariant characterization for Petrov type N space-times. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.78.783
DOI:
10.1103/PhysRevLett.78.783
PACS:
04.20.Cv, 04.20.Gz
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