2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/223635We use the worldline formalism for calculating the one-loop effective action for the Einstein-Maxwell background induced by charged scalars or spinors, in the limit of low energy and weak gravitational field but treating the electromagnetic field nonperturbatively. The effective action is obtained in a form which generalizes the standard proper-time representation of the Euler-Heisenberg Lagrangian. We compare with previous work and discuss possible applications.33 pages, 2 figuresHigh Energy Physics - TheoryGeneral Relativity and Quantum Cosmologytext