An Orientifold of Type-IIB Theory on $K3$

Abstract

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.

19 pages, harvmac; references added, minor modifications

References in corpus (6)

• Dirichlet-Branes and Ramond-Ramond Charges
• Consistency Conditions for Orientifolds and D-Manifolds
• Evidence for Heterotic/Heterotic Duality
• Orbifolds of M-theory
• Anomaly-Free Supersymmetric Models in Six Dimensions
• M-Theory on (K3 X S^1)/Z_2

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