Maxence Corman

According to Einstein's theory, massive objects cause spacetime curvature, like a heavy ball warping a rubber sheet. As they accelerate, they create ripples — gravitational waves, akin to the circles from a stone dropped in a pond.

A black hole is like a spinning top that never stops on its own. But if a cloud of ultra-light particles, bosons, forms around it, the picture changes. This "fog" acts like an invisible brake: the particles drain the hole's spin, slowing it down.