Rotating star cores can form massive disks that emit gravitational wave bursts.

When giant stars die, their cores can collapse into black holes. Scientists want to know what kinds of gravitational waves—ripples in space itself—these extreme events produce. Researchers used computer simulations to model rotating, very-massive star cores collapsing in three dimensions. When the spinning core collapses, it forms a central black hole surrounded by a dense, swirling disk of matter. If the newborn black hole spins fast enough, this disk becomes unstable and warps unevenly. This lopsided motion creates strong gravitational-wave burstsgravitational-wave burstssudden, brief ripples in spacetime produced by violent cosmic events. with frequencies around 10-50 Hz. Future detectors could easily spot these powerful ripples even from billions of light-years away, while simpler, balanced collapses make weaker signals with higher frequencies.

Why it matters

Future gravitational wave observatories like Einstein Telescope and Cosmic Explorer could detect bursts from collapsing very massive stars. These waves carry information about how black holes form from rapidly spinning cores, something current detectors cannot see. Finding them would reveal a hidden population of massive black hole births.

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