Whether they are remnants of the evolution of massive stars or supermassive holes in the centers of galaxies, black holes as exotic objects can generally be described by only a few parameters according to current astrophysics: The most important is the mass, followed by the electric charge and the third quantity is the spin or the speed of rotation. If the general theory of relativity is fully valid, the peripheral rotation speed of the event horizon cannot exceed the speed of light.
Let us recall that the event horizon represents an imaginary surface surrounding the singularity of a black hole, on which the escape velocity reaches exactly the speed of light, and no particle can escape. In the case of rotating black monsters, the situation is somewhat more complicated, as they are surrounded by two event horizons.
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Anyway, according to the general theory of relativity, in the case of a peripheral speed exceeding the speed of light, the radius of the event horizon would acquire imaginary, and thus non-physical, values. The event horizon would cease to exist and a so-called naked singularity would appear, which, of course, violates several valid laws of physics. According to the scientists’ belief, such a phenomenon cannot occur, and therefore even a black hole cannot rotate so quickly.
Research shows that a significant fraction of galactic supermassive black holes are dangerously close to this limit, and that fast-spinning black holes are significantly more common in the universe than their slow-spinning counterparts.
2023-08-11 22:46:58
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