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Use this for questions pertaining to curvature of manifolds. Does not need to be specific to general relativity, but also for curvature of e.g. a Calabi-Yau manifold.
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What allows us to assume spacetime is flat when no normal matter is present?
Why can't we say that dark matter is just the natural curvature of spacetime? Flat seems like a special case compared to the rest of possible geometries. …