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AMA | July 2023
Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas
The Relevance of Dark Matter in the Early Universe
The axion is a very light particle, 10 to the minus 5 electron volts. The idea of fuzzy cold dark matter or bose-einstein condensate dark matter are other kinds of hypothetical particles that are even lower in mass. If you have one hypothetical particle that can solve two problems at once, that's considered to be better.
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