The configuration of space near black holes can be so complex that the rays of light are bent
He described the appearance of "twins" gravitationallylensed objects using modern mathematical apparatus. The student tried to understand the features of space around black holes, where there is such a strong curvature of the spatial fabric that the rays of light deviate from their course.
As is known, in the region of the event horizon of the blackholes, the trajectory of photons can change so much that they fly around the supermassive object several times. As a result, if you observe a black hole against the background of some distant object, you can see several distorted versions of it.
The light from the background galaxy wraps aroundblack hole more and more times the closer it goes to the hole, and therefore we see the same galaxy in several directions (courtesy of Peter Laursen).
Mathematical description of gravitationallensing, presented by Albert Sneppen, explains exactly how such "twins" of lensed objects are born. He found out how the laws of gravity and the principles of the existence of black holes determine the features of the lensing effect. It is worth noting that the scientist, in addition, described lensing, generated not by ordinary, but by rotating black holes.
Once endless images close to blackhole, can become a tool for studying not only the physics of space-time of a black hole, but also objects behind them - repeating in endless reflections.
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