Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas
AMA | October 2024
Sean Carroll
We think that there's about five times as much dark matter as ordinary matter in the universe by energy budget. So you need a theory for the production of those particles that gets you the right abundance. And that's often the hardest thing to do. I mean, neutrons, if there was an equal number of neutrons and antineutrons, they would have just decayed away a long time ago.
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