2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/57502We prove that the massless Dirac operator in $\mathbb{R^3}$ with long-range potential has an a.c. spectrum which fills the whole real line. The Dirac operators with matrix-valued potentials are considered as well.21 pagesMathematical PhysicsAnalysis of PDEsOn the absolutely continuous spectrum of Dirac operatortext