2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/54725This note discusses some results on the non-BPS excitations of D-branes. We show that the excitation spectrum of a bound state of D-strings changes character when the length of the wrapping circle becomes less than $\sim g^{-1}\LS$. We review the observed relation between the low energy absorption cross-section of D-branes and the low energy absorption cross-section for black holes. We discuss various issues related to the information question for black holes.harvmac, 20 pagesHigh Energy Physics - Theorytext