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Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas

AMA | September 2024

12638.826 - 12656.272 Sean Carroll

The fact that the laws of physics are invariant with respect to what time you apply them, they're the same laws at every moment in time, that implies that energy is conserved. I think that's a perfectly good definition of what energy is. It's the thing that is conserved because of time translation invariance. So I don't think it was true in 1964 or today. Sorry.

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