Encyclopedia > I > Infraparticle
Infraparticle
In electrodynamics and quantum electrodynamics, in addition to the global U(1) symmetry related to the electric charge, we also have position dependent gauge transformations. Noether's theorem states for every infinitesimal symmetry transformation which is local in the sense that the transformed value of a field at a given point only depends upon the field configuration in an arbitrarily small neighborhood of the point in question, there corresponds a conserved charge called the Noether charge which is the space integral of a Nother density (assuming that the integral converges) and there is a Noether current satisfying the continuity equation.
Information are taken from Wikipedia, the open encyclopedia, to which contribute many volunteers from around the whole world. Texts are available under the following conditions GNU Free Documentation License.
Encyklopedie (cz) Encyklopédia (sk) Enzyklopädie (de)