Episode 136: Introduction to General Relativity
The Science of Everything Podcast
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The Riemann Curvature Tensor and the Ritchie Scalar
We need a way of describing the matter and energy content of the whole universe. In practice we make a lot of approximations and assumptions that sort of smooth over all of the specific lumpiness of this proton is here and this star is there or whatever. We can actually apply more specific interpretation to the different components of the energy momentum tensor. The elements below that on the leftmost column are the energy density numbers which describe how each particle's mass changes with its time coordinates.
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