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RE: Dark cannibalistic elders - dark matter strikes back
You actually point down one of the key point of the model. This reaction releases energy, and this allows dark matter to stay in thermal equilibrium with a temperature different from the one of the cosmic soup. But this is maybe too detailed (or not enough)?
I was just making sure that energy would still be conserved. I don't know, maybe things get weird with dark matter... I'm a dumb dumb on topics like this :)
Energy conservation is the basics. It is something very hard to give up, even for darker particles.