Kugelblitz (astrophysics)

For other uses, see Kugelblitz (disambiguation).

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 we aim enough radiation 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).

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.

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.

kugelblitz is an important plot element in Frederik Pohl's novel Heechee Rendevous.