I Dark Matter Decoupling from Plasma

Trixie Mattel
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Hello,

I have been reading about how Dark Matter particles might possibly be made up of the lightest sterile right handed neutrino.

I was wondering, why exactly does the dark matter particle have to decouple from the plasma when it is formed?
 
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All dark matter candidates had to stop interacting (significantly) with regular matter at some point, otherwise they would not be dark.
 

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