To explain why dark matter particles haven't come up in any direct detection experiments, physicists have wondered if it may be a kind of particle known as an axion.

Dark matter might make space-time ring like a bell around black holes — and we might be able to 'hear' it

Source: space
Source Link: https://www.space.com/the-universe/black-holes/dark-matter-might-make-space-time-ring-like-a-bell-around-black-holes-and-we-might-be-able-to-hear-it