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An animation of how light rays can be gravitationally bent to form a photon sphere. A photon sphere [1] or photon circle [2] arises in a neighbourhood of the event horizon of a black hole where gravity is so strong that emitted photons will not just bend around the black hole but also return to the point where they were emitted from and consequently display boomerang-like properties. [2]
It is only restricted by the speed of light. Closer to the black hole spacetime starts to deform. In some convenient coordinate systems, there are more paths going towards the black hole than paths moving away. [Note 1] Inside the event horizon all future time paths bring the particle closer to the center of the black hole.
Closed trapped surfaces are a concept used in black hole solutions of general relativity [1] which describe the inner region of an event horizon. Roger Penrose defined the notion of closed trapped surfaces in 1965. [2] A trapped surface is one where light is not moving away from the black hole.
In other words, if enough radiation is aimed into a region of space, the concentration of energy can warp spacetime so much that it creates a black hole. This would be a black hole the original mass–energy of which was in the form of radiant energy rather than matter; [ 1 ] however, there is currently no uniformly accepted method of ...
However, it is hypothesized that light entering a singularity would similarly have its geodesics terminated, thus making the naked singularity look like a black hole. [ 19 ] [ 20 ] [ 21 ] Disappearing event horizons exist in the Kerr metric , which is a spinning black hole in a vacuum, if the angular momentum ( J {\displaystyle J} ) is high enough.
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A fully general relativistic treatment, as needed for the inner part of the disk when the central object is a black hole, has been provided by Page and Thorne, [25] and used for producing simulated optical images by Luminet [26] and Marck, [27] in which, although such a system is intrinsically symmetric its image is not, because the ...
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