On a Stationary Cosmology in the Sense of Einstein's Theory of Gravitation

@article{Lanczos1997OnAS,
  title={On a Stationary Cosmology in the Sense of Einstein's Theory of Gravitation},
  author={Kornel Lanczos},
  journal={General Relativity and Gravitation},
  year={1997},
  volume={29},
  pages={363-399}
}
A world is to be considered stationary in the sense of general relativity if the coefficients of its metric are independent of time in a coordinate system in which the masses are at rest on average. The remark on the system of coordinates is important because time itself is no invariant notion but is taken only in the sense of proper time. Our definition is unique, in the form given above. On the other hand it is also possible to have points where no matter is present. At such points we may… Expand
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