2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/56452In this work we derive the Lorentz-PCT-violating effective action for a fermion in a constant and uniform electromagnetic field using the Fock-Schwinger proper time method and extract the exact value of the coefficient of the nonperturbatively induced Chern-Simons term.LaTex file, 7 pages, no figuresHigh Energy Physics - Theorytext