Open Descendants of Z_2\times Z_2 Freely-Acting Orbifolds

Abstract

We discuss Z_2 \times Z_2 orientifolds where the orbifold twists are accompanied by shifts on momentum or winding lattice states. The models contain variable numbers of D5 branes, whose massless (and, at times, even massive) modes have variable numbers of supersymmetries. We display new type-I models with partial supersymmetry breaking N=2 \to N=1, N=4 \to N=1 and N=4 \to N=2. The geometry of these models is rather rich: the shift operations create brane multiplets related by orbifold transformations that support gauge groups of reduced rank. Some of the models are deformations of six-dimensional supersymmetric type-I models, while others have dual M-theory descriptions.

LaTeX, 46 pages, 8 eps-figures

Cited by in corpus (44)

• Four-dimensional String Compactifications with D-Branes, Orientifolds and Fluxes
• On tadpoles and vacuum redefinitions in String Theory
• On Volume Stabilization by Quantum Corrections
• RR photons
• Geometric Couplings and Brane Supersymmetry Breaking
• Charged and Uncharged D-branes in various String Theories
• Gauge Unification in Highly Anisotropic String Compactifications
• D-branes in Standard Model building, Gravity and Cosmology
• Magnetized Four-Dimensional $Z_2\times Z_2$ Orientifolds
• Internal magnetic fields and supersymmetry in orientifolds
• On Classical Stability with Broken Supersymmetry
• Dilaton Tadpoles, Warped Geometries and Large Extra Dimensions for Non-Supersymmetric Strings
• String instantons, fluxes and moduli stabilization
• Open string models with Scherk-Schwarz SUSY breaking and localized anomalies
• D-branes in String theory Melvin backgrounds
• Anomalous U(1)s masses in non-supersymmetric open string vacua
• Asymmetric Orientifolds, Brane Supersymmetry Breaking and Non-BPS Branes
• $P$ fluxes and exotic branes
• Gauge Thresholds and Kaehler Metrics for Rigid Intersecting D-brane Models
• D-brane Models with Non-Linear Supersymmetry
• Generalised universality of gauge thresholds in heterotic vacua with and without supersymmetry
• On the weak gravity conjecture in string theory with broken supersymmetry
• N=2 -> 0 super no-scale models and moduli quantum stability
• Stability and vacuum energy in open string models with broken supersymmetry
• String vacua with flux from freely-acting obifolds
• On the unfolding of the fundamental region in integrals of modular invariant amplitudes
• On the quantum stability of IIB orbifolds and orientifolds with Scherk-Schwarz SUSY breaking
• On the stability of open-string orbifold models with broken supersymmetry
• Heterotic-Type I Dual Pairs, Rigid Branes and Broken Susy
• Non-tachyonic Scherk-Schwarz compactifications, cosmology and moduli stabilization
• Dilaton tadpoles and D-brane interactions in compact spaces
• Intersecting D-Branes on Shift Z2 x Z2 Orientifolds
• D-brane Spectrum and K-theory Constraints of D=4, N=1 Orientifolds
• A Class of Non-Supersymmetric Open String Vacua
• D1/D5 systems in $\mathcal{N}=4$ string theories
• Gauge symmetry breaking in orbifold model building
• A Classification of Toroidal Orientifold Models
• One-loop masses of Neumann-Dirichlet open strings and boundary-changing vertex operators
• Space-filling branes & gaugings
• Hagedorn-like transition at high supersymmetry breaking scale
• Quantum stability in open string theory with broken supersymmetry
• Non-Factorizable Branes on the Torus
• Gauge unification, non-local breaking, open strings
• Open Descendants of NAHE-based free fermionic and Type I Z2^n models