2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/184739We develop a theory based on Bohmian mechanics in which particle world lines can begin and end. Such a theory provides a realist description of creation and annihilation events and thus a further step towards a "beable-based" formulation of quantum field theory, as opposed to the usual "observable-based" formulation which is plagued by the conceptual difficulties--like the measurement problem--of quantum mechanics.11 pages LaTeX, no figures; v2: references added and updatedQuantum Physicstext