2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/50232Effects of the configuration of an external static magnetic field in the form of a singular vortex on the vacuum of a quantized massless spinor field are determined. The most general boundary conditions at the punctured singular point which make the twodimensional Dirac Hamiltonian to be self-adjoint are employed.18 pages, LaTeXHigh Energy Physics - Theorytext