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RE: Freezing-in and freezing-out dark matter
Very interesting. I never heard of this freeze-in case but, well, I am not a particle- or an astro-physicist.
Do you maybe know when the density became constant? Cause if it was after the first galaxies came to life, then maybe we could see (indirectly) much smaller or larger quantities of dark matter in very old galaxies.
It really depends on the exact model (the mass of the dark matter particle and the strength of its interactions). But in any case, it is well before the formation of any star or galaxy (we are still talking about trillions of Kelvin).
So is there any way to experimentally confirm which model is correct. If any...
For the moment, everything is viable. The dark matter experiments are doing better and better, and the improvements of the last decade allow us to hope for the best for the next decade. But for the moment, there is still room for many things (which is why it is an exciting time ^^ ).