When a star burns out and collapses under its own weight, the space around it crumples into a black hole. At the center, according to textbooks, lurks a singularity — a point where density becomes infinite and the laws of physics break down. But what if, instead of a point, there were something like a tight knot of magnetic fields?
In a new paper, physicists built a model where the heart of the hole does not collapse to zero. The matter inside is replaced by a special filling — a purely magnetic field (specifically, a monopole configuration of the electromagnetic field in nonlinear electrodynamics). Such a field acts like a spring: the harder you squeeze it, the stiffer it pushes back. As a result, infinite density never arises — the center stays smooth, with no tear in space.
The authors also tested how stable such a hole would be. They mentally struck it, and calculated how it would ring (this is called quasinormal modes). It turns out the oscillations damp out quickly, like the sound of a bell wrapped in felt. That means the structure doesn't fall apart from a random jolt — the magnetic core holds its shape.
The takeaway brings us back to the original picture: a collapsing star doesn't vanish into a mathematical point, but turns into an invisible magnetic ball that merely pretends to be a bottomless pit.
If a black hole with a magnetic core were in your room, you wouldn't fall into a singularity: you'd just be smeared across a smooth but incredibly dense surface the size of a city.
In Stanisław Lem's novel 'Solaris', the ocean also turns out not to be an abyss but a stable structure with unexpected internal organization — much like a magnetic core instead of a singularity.