Abstract
For any time-symmetric asymptotically flat initial slice with an apparent horizon, the associated four-momentum measured at spatial infinity is shown to be future-directed and time-like.
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Jang, P.S. On positivity of mass for black hole space-times. Commun.Math. Phys. 69, 257–266 (1979). https://doi.org/10.1007/BF01197447
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DOI: https://doi.org/10.1007/BF01197447