Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1999-04-29
Int.J.Mod.Phys. A15 (2000) 3461-3494
Physics
High Energy Physics
High Energy Physics - Theory
34 pages, revtex; minor misprints corrected
Scientific paper
10.1142/S0217751X00001127
We consider non-perturbative four dimensional N=1 space-time supersymmetric orientifolds corresponding to Type I compactifications on (generalized) Voisin-Borcea orbifolds. Some states in such compactifications arise in ``twisted'' open string sectors which lack world-sheet description in terms of D-branes. Using Type I-heterotic duality as well as the map between Type IIB orientifolds and F-theory we are able to obtain the massless spectra of such orientifolds. The four dimensional compactifications we discuss in this context are examples of chiral N=1 supersymmetric string vacua which are non-perturbative from both orientifold and heterotic points of view. In particular, they contain both D9- and D5-branes as well as non-perturbative ``twisted'' open string sector states. We also explain the origins of various inconsistencies arising in such compactifications for certain choices of the gauge bundle.
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