2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/107575The contribution of reducible connections to the U(N) Chern-Simons invariant of a Seifert manifold $M$ can be expressed in some cases in terms of matrix integrals. We show that the U(N) evaluation of the LMO invariant of any rational homology sphere admits a matrix model representation which agrees with the Chern-Simons matrix integral for Seifert spheres and the trivial connection.10 pages, 8 figuresGeometric Topology57N10,57M25text