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AMA | July 2023
Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas
The Importance of Having a Good Idea
Einstein's general relativity question says that the curvature of spacetime depends on the energy tensor. Does this mean that light by itself, i.e. massless but containing energy, can cause gravity? Yes, 100%. This is part of the principle of equivalence that Einstein used to inspire himself to invent general relativity. Everything with mass or energy or existence causes gravity. So yes, it not only can, but it absolutely does, and that's super important.
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