Electrical Permittivity of Vacuum State
In principle, quantum corrections to Maxwell's equations can cause the experimental electrical permittivity ε of the vacuum state to deviate from the defined scalar value ε0 of the electric constant. These theoretical developments are described, for example, in Dittrich and Gies. In particular, the theory of quantum electrodynamics predicts that the QED vacuum should exhibit nonlinear effects that will make it behave like a birefringent material with ε slightly greater than ε0 for extremely strong electric fields. Explanations for dichroism from particle physics, outside quantum electrodynamics, also have been proposed. Active attempts to measure such effects have been unsuccessful so far.
Read more about this topic: Vacuum State
Famous quotes containing the words electrical, vacuum and/or state:
“Few speeches which have produced an electrical effect on an audience can bear the colourless photography of a printed record.”
—Archibald Philip Primrose, 5th Earl Rosebery (1847–1929)
“No, it wasn’t an accident, I didn’t say that. It was carefully planned, down to the tiniest mechanical and emotional detail. But it was a mistake. It was a beaut. In the end, somehow granted the time for examination, we shall find that our so-called civilization was gloriously destroyed by a handful of vacuum tubes and transistors. Probably faulty.”
—John Paxton (1911–1985)
“The story is told of a man who, seeing one of the thoroughbred stables for the first time, suddenly removed his hat and said in awed tones, “My Lord! The cathedral of the horse.””
—For the State of Kentucky, U.S. public relief program (1935-1943)