2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/59185We give a complete description of the tautological subgroup of the fourth cohomology group of the moduli space of pointed stable curves, and prove that for g \geq 8 it coincides with the cohomology group itself. We further give a conjectural upper bound depending on the genus for the degree of new tautological relations.29 pages, 7 figuresAlgebraic Geometrytext