three dark matter particles are becoming two dark matter particles.
They do grow in size after cannibalization? The bigger the better in nature?
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three dark matter particles are becoming two dark matter particles.
They do grow in size after cannibalization? The bigger the better in nature?
No they don't grow. They stay elementary. What is missing from my simplified equation is the energy released in the reaction. As I was saying to @justtryme90 here above, this energy is crucial with respect to the dark matter behavior in the universe history.
At some point, the 3 to 2 process will stop to be effective and only the 2 to 2 one will be left. And a bit later, all processes will stop and the dark matter density will freeze out.