Discrete Deformations in Type I Vacua

Abstract

We study supersymmetric orientifolds where the world-sheet parity transformation is combined with a conjugation of some compact complex coordinates. We investigate their T-duality relation to standard orientifolds and discuss the origin of continuous and discrete moduli. In contrast to standard orientifolds, the antisymmetric tensor describes a continuous deformation, while the off-diagonal part of the metric is frozen to quantized values and is responsible for the rank reduction of the gauge group. We also give a geometrical interpretation of some recently constructed six-dimensional permutational orientifolds.

12 pages, TeX, harvmac, 4 figures, eq.(3.15) changed

References in corpus (3)

• Comments on Open-String Orbifolds with a Non-Vanishing B_{ab}
• Supersymmetric Orientifolds in 6D with D-Branes at Angles
• Discrete torsion in non-geometric orbifolds and their open-string descendants

Cited by in corpus (48)

• Four-dimensional String Compactifications with D-Branes, Orientifolds and Fluxes
• Toward Realistic Intersecting D-Brane Models
• Chiral Four-Dimensional N=1 Supersymmetric Type IIA Orientifolds from Intersecting D6-Branes
• Three-Family Supersymmetric Standard-like Models from Intersecting Brane Worlds
• Type-I strings on magnetised orbifolds and brane transmutation
• The Standard Model from Stable Intersecting Brane World Orbifolds
• Orientifolds of K3 and Calabi-Yau Manifolds with Intersecting D-branes
• Building MSSM Flux Vacua
• Standard Model at Intersecting D5-branes: Lowering the String Scale
• Supersymmetric Z_N times Z_M Orientifolds in 4D with D-Branes at Angles
• Supersymmetric 4D Orientifolds of Type IIA with D6-branes at Angles
• Intersecting Brane Models of Particle Physics and the Higgs Mechanism
• On Orientifolds, Discrete Torsion, Branes and M Theory
• Supersymmetric Intersecting Branes on the Type IIA T^6/Z_4 orientifold
• Phenomenology of A Three-Family Standard-like String Model
• Theory and Phenomenology of Type I strings and M-theory
• SUSY Quivers, Intersecting Branes and the Modest Hierarchy Problem
• Magnetized Four-Dimensional $Z_2\times Z_2$ Orientifolds
• Dimers and Orientifolds
• Asymmetric Orbifolds, Noncommutative Geometry and Type I String Vacua
• Type IIB orientifolds on Gepner points
• Asymmetric Orientifolds, Brane Supersymmetry Breaking and Non-BPS Branes
• Scherk-Schwarz Breaking and Intersecting Branes
• Type IIA Orientifolds on General Supersymmetric Z_N Orbifolds
• Intersecting D-brane Models
• Comments on Orientifolds without Vector Structure
• Induced Gravity on Intersecting Branes
• One-loop Einstein-Hilbert term in minimally supersymmetric type IIB orientifolds
• On stable higher spin states in Heterotic String Theories
• A New Class of Supersymmetric Orientifolds with D-Branes at Angles
• (Unoriented) T-folds with few T's
• Orientifold's Landscape: Non-Factorisable Six-Tori
• Heterotic-Type I Dual Pairs, Rigid Branes and Broken Susy
• Vanishing Perturbative Vacuum Energy in Non-Supersymmetric Orientifolds
• A comment on discrete Kalb-Ramond field on orientifold and rank reduction
• Non-tachyonic Scherk-Schwarz compactifications, cosmology and moduli stabilization
• Non-perturbative transitions among intersecting-brane vacua
• Intersecting D-Branes on Shift Z2 x Z2 Orientifolds
• Open Strings and Supersymmetry Breaking
• Pair Production of small Black Holes in Heterotic String Theories
• Heterotic-Type II duality and wrapping rules
• Intersecting Brane World from Type I Compactification
• Nucleon decay in gauge unified models with intersecting D6-branes
• Magnetic Fluxes, NS-NS $B$ Field and Shifts in Four-Dimensional Orientifolds
• Fractional Branes in Non-compact Type IIA Orientifolds
• From Twists and Shifts to L-R asymmetric D-branes
• Notes on unoriented D-brane instantons
• Mechanisms for Supersymmetry Breaking in Open String Vacua