2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/225124Representing the data of a string compactified on a circle in the background of H-flux in terms of the geometric data of a principal loop group bundle, we show that T-duality in type II string theory can be understood as the interchange of the momentum and winding homomorphisms of the principal loop group bundle, thus giving rise to a new interpretation of T-duality.8 pages, latex 2e, new reference added, J.Phys.A: Fast Track Publications (to appear)High Energy Physics - Theorytext