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AMA | February 2023
Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas
What Is Low Entropy in the Early Universe?
In a universe with gravity, like ours, densely packed material will be high entropy when it's lumpy. And the early universe was nothing like that at all. We don't know why the early universe had low entropy. It's provocative. One thing to try is can you just imagine turning off gravity in the early universe so that it went to a high entropy state that looked thermal and then you turn gravity back on? Brian Green and some of his collaborators wrote a paper literally about that possibility but I don't think it works.
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