A relativistic variant of the Wigner function
arXiv:quant-ph/0304171 · doi:10.1016/j.physleta.2003.12.029
Abstract
The conventional Wigner function is inappropriate in a quantum field theory setting because, as a quasiprobability density over phase space, it is not manifestly Lorentz covariant. A manifestly relativistic variant is constructed as a quasiprobability density over trajectories instead of over phase space.
v3: as accepted by Phys. Lett. A