Math just proved the inner edge of a spinning black hole is a wall of infinite gravity that basically ends the universe.
March 19, 2026
Original Paper
Non-linear instability of the Kerr Cauchy horizon near $i_+$
arXiv · 2603.17911
The Takeaway
Physicists have long debated if a traveler could survive passing deep into a black hole's interior. This proof confirms that this internal boundary is so unstable that the fabric of space-time 'blows up' into an impassable edge, effectively creating a definitive dead end where physics as we know it simply stops existing.
From the abstract
We consider solutions of the Einstein vacuum equations which arise from smooth initial data on a hypersurface slightly inside a dynamical black hole settling down to a subextremal Kerr black hole, and satisfying a precise non-linear Price's law-type estimate (which we expect to hold generically). We prove that the corresponding maximal globally hyperbolic development admits a non-trivial piece of future null boundary - the Cauchy horizon - emanating from timelike infinity $i_+$, which exhibits a