Quote Originally Posted by Rydiro View Post
So, could you make a stable black hole out of gravity waves? Just asking for a friend.
In theory you could get enough energy density of gravity waves to create a black hole. Getting sufficient density of light is ridiculously hard, and light is probably the easiest of the fundamental force carriers to control. Gravity is significantly harder and we do not currently have any means to direct it, so you would have to figure out how to handle the 1/r^2 losses. With light you can set things up so that the energy density increases with distance away from from your source (thanks to lasers).