- TL;DR Summary
- Is there a mathematical operation that transforms the Cauchy Stress Tensor to the Energy Momentum Tensor? If the former lives in 3D and latter lives in 4D, how come they have the same units?
- Why do the Cauchy Stress Tensor & the Energy Momentum Tensor have the same SI units? Shouldn't adding time as a dimension changes the Energy Momentum Tensor's units?
- Did Einstein start with the Cauchy Tensor when he started working on the right hand side of the field equations of GR?
- If so, What tensor operation(s) would transform the 3D Cauchy Tensor into the 4D Energy Momentum Tensor of GR?
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