Einstein's theory of relativity say black holes are 'bald', but a new tweak to his research may give the mysterious objects their long-sought 'hair.'
In astrophysics, there's a saying that"black holes have no hair." This means that, in the theory of general relativity, black holes are exceptionally simplistic objects. All you need to describe a black hole is its mass, its electric charge and its spin rate. With those three numbers alone, you have everything you could ever know about black holes. In other words, they're bald — they have no extra information.
This is not the only way to construct a theory of relativity, however. There's an entirely different approach that instead focuses on the"twistiness," rather than on the curvature, of space-time. In this picture, any entity with mass or energy twists up space-time around it, and that twisting instructs other objects how to move.
As an example, a team of theoretical physicists recently explored how teleparallel gravity could approach the problem of black hole hairiness. They detailed their work in a paper published to the preprint database arXiv in July. In regular curvature-based general relativity, there are only so many ways to add scalar fields. But in teleparallel gravity, there are many more options. This research team discovered a way to add scalar fields to general relativity using the teleparallel framework. Then, they used that approach to investigate if these scalar fields, which would otherwise be invisible, might show up near black holes.
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