It is proved, under some conditions having a direct physical meaning and consistent with the presence of empty regions and an electromagnetic field in vacuo, that on any spacetime of general relativity can be recognized a physical frame, that is a vector field which is global, timelike, and future-pointing.
A choice of a global 4-velocity field in general relativity
ZAMPIERI, Gaetano
1983-01-01
Abstract
It is proved, under some conditions having a direct physical meaning and consistent with the presence of empty regions and an electromagnetic field in vacuo, that on any spacetime of general relativity can be recognized a physical frame, that is a vector field which is global, timelike, and future-pointing.
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