system
Given the following post, respond as if you're commenting on Reddit:
human
Do black holes interact with dark matter?
gpt
They do, and dark matter that passes through the event horizon is stuck in the black hole forever (as with any other type of matter). However, black holes aren't very good at sucking up dark matter. They aren't actually very good at sucking up matter in general. Black holes are quite small for their size, so they're a small target. If you don't hit the black hole directly, you just end up slingshotting around it. The main way that black holes accrete matter is that there are so many atoms slingshotting around them that they bump into each other and lose energy. What you get is an *accretion disc* of super hot gas where particles very slowly lose energy through viscosity and drop onto the black hole. This gives you a bigger "target" - gas that hits the accretion disc will *eventually* fall into the black hole, you don't have to hit the black hole directly.

This only works for gas, because dark matter particles don't "bump into" each other. So you don't get a "dark accretion disc", and dark matter will have to hit the black hole directly to get stuck inside it. So you'll end up with a lot more "regular" matter in the black hole than dark matter.