I would like to say I appreciate your trying to give a more sci-fi feel to the ghosts. I think this is necessary if you plan to continue with them here. However I do agree with n00blet and Sprolf in that this more directly contradicts science, making it fantasy and not sci-fi.
Personally, I dont necessarily think ghosts have no place here. I think they are pushing the envelope a bit, but I dont think that is necessarily a bad thing. I have some other quibbles with some of the other ghost RP, but im not going to bring those up here. I would like to see a scienc-y explanation for them, maybe something having to do with DK technology, like the Donner and Blitz bit, maybe something else, but something other than this dark matter thing, something that doesnt directly contradict currently accepted scientific theories.