A Note on Orientifolds and F-theory

Abstract

An orientifold of Type-IIB theory on a $K3$ realized as a $Z_2$ orbifold is constructed which corresponds to F-theory compactification on a Calabi-Yau orbifold with Hodge numbers $(51,3)$. The T-dual of this model is analogous to an orbifold with discrete torsion in that the action of orientation reversal has an additional phase on the twisted sectors, and both 9-branes and 5-branes carry orthogonal gauge groups. An orientifold of the $Z_3$ orbifold and its relation to F-theory is briefly discussed.

11 pages, harvmac

References in corpus (10)

• Compactifications of F-Theory on Calabi--Yau Threefolds -- II
• Compactifications of F-Theory on Calabi--Yau Threefolds -- I
• Phase Transitions In M-Theory And F-Theory
• Comments on String Dynamics in Six Dimensions
• K3 Orientifolds
• Tensors from K3 Orientifolds
• An Orientifold of Type-IIB Theory on $K3$
• Orbifolds of M-Theory and String Theory
• Multiple Realisations of N=1 Vacua in Six Dimensions
• M-Theory on (K3 X S^1)/Z_2

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• Gauge/Gravity Duality in Heterotic String Theory
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