Matter waves in terms of the unitary representations of the Lorentz group
arXiv:hep-th/0602104 · doi:10.1002/andp.200710327
Abstract
In a generalized Heisenberg/Schroedinger picture, the unitary representations of the Lorentz group may, for a massive relativistic particle, be used to attribute to waves an extra wavelength that is longer than the de Broglie wavelength. Propagators are defined as spacetime transitions between states with different eigenvalues of the first or the second Casimir operator of the Lorentz algebra.
15 pages latex, to be published in Annalen der Physik