Comment Re:Dark matter or antimatter? (Score 3, Informative) 113
I think you are confusing "massive" and "strongly interacting".
The whole point of "dark matter" is that it interacts gravitationally with ordinary matter, but almost never in any other way. So, having massive dark matter particles means a higher gravitational field around them, but nothing else.
I agree with your other point however, that having two of these dark matter particles annihilating directly to a electron/positron pair seems.. strange. Normal matter/antimatter annihilations always (afaik) produce "energy" (i.e. photons).
But a good thing is that if annihilation of dark matter produces electron/positron pairs, then smashing electrons and positrons together in an accelerator should produce dark matter.