Hello, I've been doing some research on gravitational waves since their discovery, and I found that all of the places I looked were missing an important piece of information, that is: What is the mechanism by which angular momentum is being conserved. All of places that I've searched will effectively just say "the black holes orbits decrease because conservation of angular momentum, and that mass is converted to energy and propagated as the waves". But they don't explain why the mass is being lost to begin with, just that it conforms with a law of physics. To explain what I am getting at with an analogy: When a baseball is hit with a bat, some of the energy in the system is lost because there is a batter holding the bat, and the battery is in contact with the ground, so the kinetic energy of the ball impacting the bat is partially lost to the ground beneath it. As a result of all of this, the overall amount of energy is conserved. In the context of the black hole merger, I understand that when the "bat" and the "ball" (i.e. the two black holes) merge, some energy is lost to the "ground beneath" (i.e. space), as that conforms with the law of conservation of angular momentum, but while I understand that the bat and the ball lose energy in the analogy due to the bat being connected to the ground, and therefore some of the kinetic energy will propagate through the batter and into the ground, I don't understand why the two black holes have to dump energy. Understand what I'm getting at?