2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/203775In the OSp invariant closed string field theory, we construct the states corresponding to parallel D-branes that are located at different points in the space-time. Using these states, we evaluate annulus amplitudes. We show that the results coincide with those of first quantized string theory.14 pages, 3 figuresHigh Energy Physics - Theorytext