Black Hole Without a Dangerous Center ⚡ экспресс
A static spherically symmetric regular black hole is constructed with a Minkowski core and a degenerate inner horizon, where the surface gravity vanishes. The outer horizon is non-extremal. In the large-mass regime, when $$r_+=2M$$, the Kretschmann scalar is almost independent of the ADM mass and is primarily determined by the inner horizon radius $$r_-$$; by adjusting $$r_-$$, the curvature is everywhere kept below the Planck level. The mass inflation near the inner horizon changes from exponential to power-law. In particular, in the double null shell model and the Ori model, the interior Misner-Sharp mass remains finite at late times and tends to $$r_-/2$$.
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.
🎯 Thanks to the vanishing gravity at the inner boundary, a falling observer doesn’t turn into plasma at the horizon—the 'firewall' problem is bypassed.
🎬 In the movie 'Interstellar,' the characters fly through a black hole—perhaps a regular model like this makes it a bit less fantastical.