The Stress Energy Tensor in the Biggest Ideas

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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.

Welcome to the December 2022 Ask Me Anything episode of Mindscape! These monthly excursions are funded by Patreon supporters (who are also the ones asking the questions). We take questions asked by Patreons, whittle them down to a more manageable number — based primarily on whether I have anything interesting to say about them, not whether the questions themselves are good — and sometimes group them together if they are about a similar topic. Enjoy!

Remember that I take a holiday break at the end of the year, so the next AMA will be at the beginning of February.

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