Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas
303 | AMA | February 2025
Sean Carroll
You say, I have Einstein's equation in general relativity. Under assumptions of homogeneity and isotropy, this turns into a differential equation for the scale factor of the universe, the relative size of the universe at different times, called the Friedmann equation. And the Friedmann equation depends on the sources of matter and energy and curvature in the universe.
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