Solitary waves of nonlinear Dirac, Maxwell-Dirac and Klein-Gordon-Dirac equations are considered. We prove that the energy-momentum relation for solitary waves coincides with the Einstein energy-momentum relation for point particles.
@article{arxiv.1404.6941,
title = {Energy-momentum relation for solitary waves of nonlinear Dirac equations},
author = {T. V. Dudnikova},
journal= {arXiv preprint arXiv:1404.6941},
year = {2014}
}