So I have my big list of theories, some more mad than others, but the dark matter ones that assume a weakly interacting particles.
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Both created at start of universe
Universe started with matter, antimatter & dark matter. The matter & antimatter annihilated each other leaving a small amount of matter & lots of dark matter.
Dark matter came first
Matter & antimatter got spat out of dark matter quasars in the early universe & then got captured by other nearby dark matter galaxies.
Matter came first
Dark matter is created by black holes etc. etc...
What is dark matter
Single type of weakly interacting particle. Does it strongly or weakly interact with its self?
Dark matter is made of many particle types that interact with each other.
Dark matter molecules etc?
Dark matter structures at larger scale ... dark matter parallel universes.
Why does it not interact?
It does interact but its rest mass / energy is too small to detect.
Some kind of neutrino
Only exists a one fixed energy level that can not be changed.
Is virtual particles associated with photons leaving the galaxies.
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I think I go for the dark matter created at the start of the universe, but multiple particle types.
Anybody like some of the others or has better ideas I should add to my list?