Astrophysicists are close to proving the existence of primordial black holes
On November 12, 2025, a ripple passed through the fabric of spacetime and triggered alarms at three gravitational-wave observatories across two continents. The signal, catalogued as S251112cm, was unusual in a way that stopped astrophysicists cold: at least one of the objects that created it appeared to weigh less than the sun. No known stellar process produces a black hole that small. Stars that collapse into black holes leave remnants several times the sun’s mass, at minimum. Something lighter has only one plausible origin, an object that formed not from a dying star but from the raw density of the universe itself, fractions of a second after the Big Bang. Two researchers at the University of Miami believe they now have a framework to explain what LIGO may have found. The case for a primordial origin Nico Cappelluti, an associate professor in the Department of Physics, and Ph.D. student Alberto Magaraggia have published research in the Astrophysical Journal building a quantitative case that the November signal is consistent with a primordial black hole, a class …






