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Usually, a black hole is an abyss with a point-like dip at the center, where density is infinite and everything breaks down. Einstein and Schwarzschild described such a scenario. But infinity is a sign that the theory stumbled. The new model suggests that a black hole is like a whirlpool with a safe bottom: the funnel suddenly becomes mirror-smooth. You fall in, and instead of being torn apart, you gently settle into calm emptiness. This is achieved by a special inner boundary where gravity disappears. It keeps spacetime curvature at an acceptable level. The smaller this boundary, the smoother the transition. The inner mass doesn’t explode to infinity but freezes at a finite value: this is the key to understanding the quantum essence of black holes and uniting gravity with the micro-world. A surprising twist: the curvature inside barely depends on the hole’s total mass. A giant can be as gentle inside as a tiny one.

Original abstract

as written by the authors arXiv:2605.15576

We construct a static spherically symmetric regular black hole with a Minkowski core, and a degenerate inner horizon with vanishing surface gravity. The spacetime contains a non-extremal outer horizon and exhibits two notable features. Firstly, in the large-mass regime with $$r_+=2M$$, the Kretschmann scalar becomes nearly independent of the ADM mass and is mainly controlled by the inner horizon radius $$r_-$$, so that the curvature of spacetime remains sub-Planckian everywhere by choosing $$r_-$$ appropriately. Secondly, the near inner horizon amplification is softened from exponential to power-law behavior. In particular, within the double-null shell and Ori models, the internal Misner-Sharp mass remains finite at late times and approaches $$r_-/2$$.