Self-adjointness of semi-relativistic Pauli-Fierz Hamiltonian
  The spinless semi-relativistic Pauli-Fierz Hamiltonian $H$ in quantum electrodynamics is considered. The self-adjointness and essential self-adjointness of $H$ are shown. It is emphasized that it includes the massless case. Furthermore, the self-adjointness and the essential self-adjointness of the semi-relativistic Pauli-Fierz model with a fixed total momentum is also proven. 
Takeru Hidaka and Fumio Hiroshima
math-ph math.MP