•I’m
no expert on this stuff (and in some sense NO ONE is). Particle physicists play
in this area more than astronomers.
•Leading
candidates include
–Axions. Cold, low mass, avoid strong CP violation.
–Neutrinos. Hot, low mass (getting better constrained),
lots of them. SN helps.
–WIMPs. Gravitino, photino, etc.
–Mirror
Matter. May use in my
next novel.
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