F Theory Orientifolds, M Theory Orientifolds, and Twisted Strings

Abstract

Orientifolds of the type IIB superstring that descend from F theory and M theory orbifolds are studied perturbatively. One finds strong evidence that a previously ignored twisted open string is required in these models. An attempt is made to interpret the $J$ type torsion in F theory where one finds a realization of Gimon and Johnson's models which does not require these twisted strings. S-duality also provides evidence for these strings.

22 pages, Harvmac.tex, Tables.tex

References in corpus (12)

• Branes Intersecting at Angles
• Non-Perturbative Superpotentials In String Theory
• F-theory and Orientifolds
• Small $E_8$ Instantons and Tensionless Non-critical Strings
• K3 Orientifolds
• Strings on Orientifolds
• An Orientifold of Type-IIB Theory on $K3$
• A Non-Perturbative Superpotential With $E_8$ Symmetry
• Orbifold and Orientifold Compactifications of F-Theory and M-Theory to Six and Four Dimensions
• An Orientifold from F Theory
• Orbifolds of M-Theory and String Theory
• Multiple Realisations of N=1 Vacua in Six Dimensions

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• D=4,N=1, Type IIB Orientifolds
• Type I vacua with brane supersymmetry breaking
• New Phases of String Theory and 6d RG Fixed Points via Branes at Orbifold Singularities
• Supersymmetric Orientifolds in 6D with D-Branes at Angles
• Gauge couplings in four-dimensional Type I string orbifolds
• Supersymmetry breaking, open strings and M-theory
• Consistency Conditions for Branes at Orbifold Singularities
• Tensor and Vector Multiplets in Six-Dimensional Supergravity
• Type IIB Orientifolds, F-theory, Type I Strings on Orbifolds and Type I - Heterotic Duality
• Type IIB Orientifolds with NS-NS Antisymmetric Tensor Backgrounds
• Superstring Theory and CP- Violating Phases: Can They Be Related?
• All Couplings of Minimal Six-dimensional Supergravity
• The Mirror Transform of Type I Vacua in Six Dimensions
• Open Descendants of Z_2\times Z_2 Freely-Acting Orbifolds
• Non-Perturbative Heterotic D=6,4 Orbifold Vacua
• On Four Dimensional N=1 Type I Compactifications
• Discrete torsion in non-geometric orbifolds and their open-string descendants
• The twelve dimensional super (2+2)-brane
• On the Complementarity of F-theory, Orientifolds, and Heterotic Strings
• Dirichlet Joyce Manifolds, Discrete Torsion and Duality
• Anomaly Free Non-Supersymmetric Large $N$ Gauge Theories from Orientifolds
• Large N Gauge Theories from Orientifolds with NS-NS B-flux
• Non-perturbative Orientifolds
• Open-string models with broken supersymmetry
• Some Properties of Tensor Multiplets in Six-Dimensional Supergravity
• Non-perturbative K3 Orientifolds with NS-NS B-flux
• Type I on (Generalized) Voisin-Borcea Orbifolds and Non-perturbative Orientifolds
• D=4, N=1, Type IIA Orientifolds