2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/55849It is shown how the topological string amplitudes encode the BPS structure of wrapped M2 branes in M-theory compactification on Calabi-Yau threefolds. This in turn is related to a twisted supersymmetric index in 5 dimensions which receives contribution only from BPS states. The spin dependence of BPS states in 5 dimensions is captured by the string coupling constant dependence of topological string amplitudes.19 pagesHigh Energy Physics - Theorytext