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In theoretical physics, a kugelblitz (German: "ball lightning") is a concentration of light so intense that it forms an event horizon and becomes self-trapped: according to general relativity, if enough radiation is aimed into a region, the concentration of energy can warp spacetime enough for the region to become a black hole (although this would be a black hole whose original mass-energy had been in the form of radiant energy rather than matter). In simpler terms, a kugelblitz is a black hole formed from energy as opposed to mass. According to Einstein's general theory of relativity, once an event horizon has formed, the type of mass-energy that created it no longer matters. A kugelblitz is so hot it surpasses the Planck temperature, the temperature of the universe seconds after The Big Bang. The best-known reference to the kugelblitz idea in English is probably John Archibald Wheeler's 1955 paper "Geons",〔 〕 which explored the idea of creating particles (or toy models of particles) from spacetime curvature. Wheeler's paper on geons also introduced the idea that lines of electric charge trapped in a wormhole throat might be used to model the properties of a charged particle-pair. A kugelblitz is an important plot element in Frederik Pohl's novel ''Heechee Rendezvous''. ==See also== *Geon 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Kugelblitz (astrophysics)」の詳細全文を読む スポンサード リンク
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