2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/51213We study the plane wave limit of $AdS_5\times S^5/Z_2$ which arises as the near horizon geometry of D3-branes at an orientifold 7-plane in type I' theory. We analyze string theory in the resulting plane wave background which contains open strings. We identify gauge invariant operators in the dual $Sp(N)$ gauge theory with unoriented closed and open string states.23 pages, 2 figures, latex, typos corrected, references addedHigh Energy Physics - Theorytext