2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/205525By introducing the noncommutativity in the world sheet, we discuss a modification of the D-brane states in the closed string theory. In particular we show how the world sheet noncommutativity induces a nonperturbative effect to the D-brane states.10 pages, no figuresHigh Energy Physics - Theorytext