Why doesn dark matter fall into a black hole?
A previously answered question stated that our galaxy could not be “sucked in” to the Black Hole at it’s center because of the great distance between it and the nearest matter. If 95% of the universe is composed of “Dark Matter” and ergo also our Milky Way, then why isn’t it feeding the Black Hole thereby increasing the event horizon to “someday” include all of the galaxy? You are right that the black hole at the center of the galaxy is increasing in mass as material falls onto it; this causes the Schwarzchild radius to increase a bit as well. However, dark matter very rarely falls into black holes for the same reasons that we don’t see it: it interacts very little with itself and with ordinary matter. This is a problem because particles lose a quantity called angular momentum (which is proportional to the speed at which they circle around the galactic center and to their distance from it) by interacting with other particles. Now, the laws of physics say that in order for particles in
