2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/197961A class of topological field theories like the $BF$ model and Chern-Simons theory, when quantized in the Landau gauge, enjoys the property of invariance under a vector supersymmetry, which is responsible for their finiteness. We introduce a new type of gauge fixing which makes these theories invariant under an extended $BRS$ symmetry, containing a new type of field, the ghost of diffeomorphisms. The presence of such an extension is naturally related to the vector supersymmetry discussed before.6 pages, LaTeX, no figuresHigh Energy Physics - Theorytext