Dark matter/Dark antimatter Asymmetry?

alemsalem

is there evidence to believe that there is an Asymmetry?, for example from the very early universe when there was interaction and annihilation between dark matter and matter

Chronos

Your question is too vague. There is no evidence dark matter and baryonic matter ever interacted to any significant degree.

Chalnoth

The general expectation is that there probably isn't any matter/anti-matter asymmetry in dark matter, because dark matter interacts too weakly with itself at lower temperatures to annihilate.

alemsalem

But from what I heard, according to popular models the WIMPs where annihlating into standard model particles and where in thermal equilibrium. until some point when they fell out of equilibrium. is that not true?

Chalnoth

It depends a bit on the model, but typically they stop annihilating while there's still a large amount of both matter and anti-matter making up the dark matter.

alemsalem

So if it had stayed long enough in equilibrium (after the baryon Asymmetry is there), will the Dark matter asymmetry be a prediction?

Thanks!!

Chalnoth

I don't think there's any reason to connect the baryon asymmetry to a hypothetical dark matter asymmetry. But no, I don't think that dark matter can behave the way it does and still annihilate with itself so often.