2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/162832For any compact manifold of dimension n>=5, we prescribe the volume and any finite part of the spectrum of the Hodge Laplacian acting on diffential forms of degree 1<p<n-1 (exept for p=n/2 if n is even), within a given conformal class. When n<5 and when p=0,1,n-1,n, and p=n/2 if n is even, this simultaneous prescription of the volume, the spectrum and the conformal class is known to be impossible.18 pages, 4 figures, in french. v3: some errors correctedDifferential GeometrySpectral Theory58J50, 58C40, 53A30text