In order to create a space/time portal, like the one witnessed in DS9, that we know as a 'wormhole' you have to have two points of the curvature of space/time meeting and effectively lessening the distance between two points. But in DS9, with the bajoran wormhole, it was space you were traversing, not time. But the same parameters apply. Both are based in relativity, and have potential for logical scientific explanation even in a fictional universe based on scientific principles. This red matter/black hole/time portal non-sense does not!
Read this: http://imagine.gsfc.nasa.gov/docs/as...s/041130a.html
Black holes were previously used for travel through space and time in "Tomorrow is Yesterday" and "Star Trek: The Motion Picture"
Star Trek the motion picture featured a wormhole, not a black hole. And it was a worm hole of relative space, not relative time.