Episode 136: Introduction to General Relativity
The Science of Everything Podcast
00:00
The Rishi Tensor and Newtonian Gravitational Equations
The rate at which your gravitational field changes is directly proportional to the mass density in that area. So Einstein was sort of looking at this and thinking, huh that's interesting. What if instead of saying one bit of the tensor is equal to another bit of the Tensor, say that the whole tensor isequal to the whole other tensor? That actually can describe something that will be invariant across reference frames and across coordinate systems as well. And he combined those ideas together and imagined they could be used for describing curvature using objects like gravity under Newton-Kartan theory.
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