2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/141767We develop a method, initially due to Salamon, to compute the space of ``invariant'' forms on an associated bundle X=P\times_G V, with a suitable notion of invariance. We determine sufficient conditions for this space to be d-closed. We apply our method to the construction of Calabi-Yau metrics on TCP^1 and TCP^2.36 pages. v2: changed title, added new examples in 7.2Differential Geometry53C25 (Primary); 53C30, 57S15, 68W30 (Secondary)text