Tensors from K3 Orientifolds

Abstract

Recently Gimon and Johnson (hep-th/9604129) and Dabholkar and Park (hep-th/9604178) have constructed Type I theories on K3 orbifolds. The spectra differ from that of Type I on a smooth K3, having extra tensors. We show that the orbifold theories cannot be blown up to smooth K3's, but rather $Z_2$ orbifold singularities always remain. Douglas's recent proposal to use D-branes as probes is useful in understanding the geometry. The $Z_2$ singularities are of a new type, with a different orientifold projection from those previously considered. We also find a new world-sheet consistency condition that must be satisfied by orientifold models.

References added. 16 pages, LaTeX

References in corpus (8)

• D-branes, Quivers, and ALE Instantons
• Consistency Conditions for Orientifolds and D-Manifolds
• Gauge Fields and D-branes
• Anomalies, Dualities, and Topology of D=6 N=1 Superstring Vacua
• K3 Orientifolds
• Strings on Orientifolds
• An Orientifold of Type-IIB Theory on $K3$
• Multiple Realisations of N=1 Vacua in Six Dimensions

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