Tensors from K3 Orientifolds

Details Tensors from K3 Orientifolds Tensors from K3 Orientifolds

1996-06-26

arxiv.org/abs/hep-th/9606165v2

Phys.Rev.D55:6423-6428,1997

Physics

High Energy Physics

High Energy Physics - Theory

References added. 16 pages, LaTeX

Scientific paper

10.1103/PhysRevD.55.6423

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.

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