Phys. Rev. Lett. 93, 231101 (2004) [4 pages]A New Geometric Invariant on Initial Data for the Einstein EquationsReceived 14 July 2004; published 1 December 2004 For a given asymptotically flat initial data set for Einstein equations a new geometric invariant is constructed. This invariant measures the departure of the data set from the stationary regime; it vanishes if and only if the data are stationary. In vacuum, it can be interpreted as a measure of the total amount of radiation contained in the data. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.231101
DOI:
10.1103/PhysRevLett.93.231101
PACS:
04.20.Ex, 04.20.Cv, 04.20.Fy, 04.20.Ha
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