2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/220550We present a model-independent argument showing that massless particles interacting with gravity in a Minkowski background space can have at most spin two. This result is proven by extending a famous theorem due to Weinberg and Witten to theories that do not possess a gauge-invariant stress-energy tensor.21 pages. To appear in PRD; two additional referencesHigh Energy Physics - Theorytext