Kugelblitz_(astrophysics)
A kugelblitz (German: [ˈkuːɡl̩ˌblɪt͡s] ⓘ) is a theoretical astrophysical object predicted by general relativity. It is a concentration of heat, light or radiation so intense that its energy forms an event horizon and becomes self-trapped. 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 whose original mass–energy was in the form of radiant energy rather than matter,[1] however as soon as it forms, it is indistinguishable from an ordinary black hole.
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John Archibald Wheeler's 1955 Physical Review paper entitled "Geons" refers to the kugelblitz phenomenon and explores the idea of creating such particles (or toy models of particles) from spacetime curvature.[2]
The kugelblitz phenomenon has been considered a possible basis for interstellar engines (drives) for future black hole starships.[3][4][non-primary source needed]