Non-perturbative K3 Orientifolds with NS-NS B-flux
arXiv:hep-th/9905033 · doi:10.1016/S0370-2693(99)00722-4
Abstract
We consider non-perturbative six dimensional N=1 space-time supersymmetric orientifolds of Type IIB on K3 with non-trivial NS-NS B-flux. All of these models are non-perturbative in both orientifold and heterotic pictures. Thus, some states in such compactifications arise in ``twisted'' open string sectors which lack world-sheet description in terms of D-branes. We also discuss their dual F-theory compactifications on certain Voisin-Borcea orbifolds. In particular, the explicit construction of non-perturbative K3 orientifolds with NS-NS B-flux gives additional evidence for the conjectured extension of Nikulin's classification in the context of Voisin-Borcea orbifolds.
15 pages, revtex; minor misprints corrected, clarifying remarks and references added (to appear in Phys. Lett. B)
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