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Maximum Principles for Null Hypersurfaces and Null Splitting Theorems

Gregory J. Galloway

math.DGarXiv:math/9909158

Abstract

A maximum principle for C0 null hypersurfaces is obtained and used to derive a splitting theorem for spacetimes which contain null lines. As a consequence of this null splitting theorem, it is proved that an asymptotically simple vacuum (Ricci flat) spacetime which contains a null line is isometric to Minkowski space.

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