Black hole singularity is a surface not a point

[Submitted connected 21 Aug 2026]

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Abstract:It is wide repeated successful the celebrated lit and elsewhere that the singularity astatine the halfway of a achromatic spread is simply a point. It is not true. Two observers who free-fall into a spherical achromatic spread on 2 different angular trajectories astatine the aforesaid clip $t$ do not brushwood each different astatine the cardinal singularity; rather, they suffer causal interaction pinch each different already good distant from the singularity. Counterintuitively, successful wide relativity 2 points tin beryllium spatially adjacent yet causally distant. The singularity is simply a surface, not a point. The communicative for rotating achromatic holes is much complicated, but the aforesaid conclusion holds. For a rotating achromatic hole, the singular aboveground almost surely resides astatine its soul horizon, wherever moreover the tiniest classical aliases quantum perturbations ignite the exponential wide ostentation instability, precipitating illness to a spacelike singular surface. There are implications for quantum gravity. We reason that, immoderate the eventual mentation of quantum gravity whitethorn be, the quantum states of a achromatic spread astir apt reside astatine its efficaciously 2-dimensional singular surface, which coevolves unitarily with, and successful thermodynamic equilibrium with, the basking ambiance of trapped Hawking radiation that the achromatic spread generates wrong its arena horizon.