2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/119047Singularities of Spin(7) manifolds are considered in the worldsheet approach, and it is argued that the internal CFT describing a singular spin(7) has an enhanced ${\cal SW}({3\over 2},{3\over 2},2)$ algebra tensored with ${\cal N}=1$ linear dilaton CFT, much like singular Calabi-Yau CFTs have a ${\cal N}=2$ linear dilaton tensored with a suitable ${\cal N}=2$ SCFT. Upon adding fundamental strings, these vacua are related to $AdS_3$ vacua with ${\cal N}=1$ supersymmetry, completing the worldsheet classification of $AdS_3$ vacua with NS flux.High Energy Physics - Theorytext