2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/51709It is shown how to calculate simple vacuum diagrams in light-cone quantum field theory. As an application, I consider the one-loop effective potential of phi^4 theory. The standard result is recovered both with and without the inclusion of zero modes having longitudinal momentum k^+ = 0.4 pages, no figures, REVTeX 4, v2: reference addedHigh Energy Physics - TheoryHigh Energy Physics - Phenomenologytext