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by bitdizzy
1901 days ago
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> I am curious as to how? Special relativity describes a flat lorentzian manifold. The uniform expansion of the universe implies that the curvature of spacetime is slightly negative. Special relativity is not simply a theory of causality but specifically of the geometry of spacetime. From this theory you can derive predictions about specific phenomena, like causality. But that doesn't mean other spacetime geometries don't share properties with flat minkowski spacetime. Just not all properties. For example there is no cosmological horizon in minkowksi spacetime but there is for our universe. |
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https://en.wikipedia.org/wiki/Cosmological_horizon
Oh, that's the term that I was groping for. Thanks!