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AMA | December 2022
Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas
The Stress Energy Tensor in the Biggest Ideas
There is something called the stress energy tensor, the right-hand side of Einstein's equation. It was invented long ago in some form or another; we come to understand it better and better as time goes on. The best way of thinking about the stressEnergyTensor is basically the tiny variation of the matter action with respect to changes in the metric.
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