2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/52184Witten has argued that charges of Type I D-branes in the presence of an H-flux, take values in twisted KO-theory. We begin with the study of real bundle gerbes and their holonomy. We then introduce the notion of real bundle gerbe KO-theory which we establish is a geometric realization of twisted KO-theory. We examine the relation with twisted K-theory, the Chern character and provide some examples. We conclude with some open problems.23 pages, Latex2e, 2 new references addedHigh Energy Physics - Theorytext