2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/50623The question as to whether the integrality of the spectrum of observed electric charges is due to a quantum effext has fascinated theoretical physicists throughout the last century. It leads to unanswered questions at the heart of quantum field theory and its role as a framework for particle physics.9 pages, no figures, invited conference talkHigh Energy Physics - Theorytext