2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/213807We evaluate one-loop effects for $QED_{3+1}$ in the presence of an extra compactified dimension, in a non-trivial vacuum for the gauge field, such that a non-vanishing magnetic flux is encircled along the extra dimension. We obtain the vacuum polarization tensor and evaluate the exact parity breaking term.13 pages, no figuresHigh Energy Physics - Theorytext