An Orientifold of Type-IIB Theory on $K3$

Details An Orientifold of Type-IIB Theory on $K3$ An Orientifold of Type-IIB Theory on $K3$

1996-02-07

arxiv.org/abs/hep-th/9602030v2

Nucl.Phys. B472 (1996) 207-220

Physics

High Energy Physics

High Energy Physics - Theory

19 pages, harvmac; references added, minor modifications

Scientific paper

10.1016/0550-3213(96)00199-X

A new orientifold of Type-IIB theory on $K3$ is constructed that has $N=1$ supersymmetry in six dimensions. The orientifold symmetry consists of a $Z_2$ involution of $K3$ combined with orientation-reversal on the worldsheet. The closed-string sector in the resulting theory contains nine tensor multiplets and twelve neutral hypermultiplets in addition to the gravity multiplet, and is anomaly-free by itself. The open-string sector contains only 5-branes and gives rise to maximal gauge groups $SO(16)$ or $U(8)\times U(8)$ at different points in the moduli space. Anomalies are canceled by a generalization of the Green-Schwarz mechanism that involves more than one tensor multiplets.

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