2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/189650We present and discuss BPS instanton solutions that appear in type II string theory compactifications on Calabi-Yau threefolds. From an effective action point of view these arise as finite action solutions of the Euclidean equations of motion in four-dimensional N=2 supergravity coupled to tensor multiplets. As a solution generating technique we make use of the c-map, which produces instanton solutions from either Euclidean black holes or from Taub-NUT like geometries.35 pages, some clarifications addedHigh Energy Physics - Theorytext