Weyl's postulate
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Weyl's postulate states that the world lines of the galaxies form a three-bundle of non-intersecting geodesics orthonormal to a series of space-like hypersurfaces.
It is a fundamental assumption of the Big bang theory. A rough translation is "that a global time and space coordinate system can be defined, where time is, on average, in some sense locally perpendicular to space".
See also
External links
- Keel, William C., "Cosmology in the Friedman Universe (http://www.astr.ua.edu/keel/galaxies/friedman.html)". bildad.astr.ua.edu.