A thunderbolt of mathematical failure destroys our current understanding of black holes before they even finish evaporating.
Standard equations use semiclassical gravity to describe how black holes slowly lose mass and vanish over trillions of years. This study reveals that these equations actually trigger a massive singularity that spreads across the entire horizon, effectively breaking the theory. This failure happens at a much larger scale than anyone predicted, meaning our current math is fundamentally flawed for describing a dying black hole. It creates a physical wall that prevents us from resolving the famous paradox of what happens to information falling inside. This discovery forces a total rethink of how gravity and quantum mechanics interact in the most extreme environments in the universe.
Breakdown of Semiclassical Gravity in Four-Dimensional Black Hole Evaporation
arXiv · 2605.00780
We study black hole formation and evaporation in a four-dimensional semiclassical model that preserves diffeomorphism invariance and reproduces the one-loop trace anomaly. Solving the quantum-corrected Einstein equations for the collapse of a spherically symmetric null shell, we follow the formation and evaporation of a black hole with back-reaction included. The semiclassical solutions develop a spacelike thunderbolt singularity that emerges after the apparent horizon has receded and extends fa