The universe is populated by millions of black holes such as the one at the center of our own galaxy and collisions between black holes are thought to be a relatively common event. When they collide, colossal amounts of gravitational waves are created. These waves are travelling ripples in spacetime fabric, the same fabric black holes are made of. According to the teams results, when black holes collide at very large speeds they swallow the waves they generated thus, two small black holes colliding at large energies may result in two slowly moving, fat black holes.
This study, by Sperhake, Berti, Cardoso and Pretorius, provides more insight on the way black holes are born, how they interact and how they emit gravitational waves. These waves have also been called Einstein messengers, and are currently being studied and scrutinized by hundreds of scientists worldwide.