2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/52330We estimate the instanton-induced vacuum energy in non-commutative U(1) Yang-Mills theory in four dimensions. In the dilute gas approximation, it is found to be plagued by infrared divergences, as a result of UV/IR mixing.17 pages, LaTeX2eHigh Energy Physics - Theorytext