2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/177654The nonlinear interaction, due to quantum electrodynamical (QED) effects, between two electromagnetic pulses and a radiation gas is investigated. It is found that the governing equations admit both modulational and filamentational instabilities. The instability growth rates are derived, and the results are discussed.7 pages, version to appear in New J. PhysHigh Energy Physics - Phenomenologytext