2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/57693It is shown that the topological invariants associated with the two-dimensional world-surface in string theory have nontrivial fluctuations around their nonexistent classical dynamics. Additionally it is proved that the underlying geometrical structure in a covariant phase space formulation for such topological string actions mimics entirely that of an Abelian gauge theory17 pages, submitted to Phys. Lett. B (2004)Mathematical Physicstext