Self-adjoint extensions of Dirac operators with Coulomb type singularity
  In this work we construct self-adjoint extensions of the Dirac operator associated to Hermitian matrix potentials with Coulomb decay and prove that the domain is maximal. The result is obtained by means of a Hardy-Dirac type inequality. In particular, we can work with some electromagnetic potentials such that both, the electric potential and the magnetic one, have Coulomb type singularity. 
Naiara Arrizabalaga, Javier Duoandikoetxea and Luis Vega
math.AP math-ph math.MP