Quantum states with space-like energy-momentum
arXiv:hep-th/0412137 · doi:10.2478/s11534-006-0014-1
Abstract
A common assumption in quantum field theory is that the energy-momentum 4-vector of any quantum state must be time-like. It will be proven that this is not the case for a Dirac-Maxwell field. In this case quantum states can be shown to exist whose energy-momentum is space-like.
Accepted by the Central European Journal of Physics. Major changes from previous copy