"Dark Energy: Enabling Perfect Pairings of Black Holes in Binary Systems"

Binary black holes may be more stable than previously thought, thanks to the action of dark energy. The expansion of the universe caused by dark energy helps black holes in binary pairs maintain a safe distance from each other. As black holes move, they create gravitational waves that carry angular momentum away from the system, causing the black holes to spiral together and eventually collide. However, the researchers found that two non-rotating black holes could exist in equilibrium, with the gravitational attraction between them counteracted by expansion. This means that from a distance, a pair of black holes would look like a single black hole. The researchers believe their solution could also apply to rotating black holes and more complex black hole systems.