On the stability of open-string orbifold models with broken supersymmetry

Abstract

We consider an open-string realisation of $\mathcal{N}=2\to \mathcal{N}=0$ spontaneous breaking of supersymmetry in four-dimensional Minkowski spacetime. It is based on type IIB orientifold theory compactified on $T^2\times T^4/{\mathbb{Z}}_2$, with Scherk--Schwarz supersymmetry breaking implemented along $T^2$. We show that in the regions of moduli space where the supersymmetry breaking scale is lower than the other scales, there exist configurations with minima that have massless Bose-Fermi degeneracy and hence vanishing one-loop effective potential, up to exponentially suppressed corrections. These backgrounds describe non-Abelian gauge theories, with all open-string moduli and blowing up modes of $T^4/{\mathbb{Z}}_2$ stabilized, while all untwisted closed-string moduli remain flat directions. Other backgrounds with strictly positive effective potentials exist, where the only instabilities arising at one loop are associated with the supersymmetry breaking scale, which runs away. All of these backgrounds are consistent non-perturbatively.

1+66 pages, 6 figures. v2: New results. Stable models with massless Bose-Fermi degeneracy exist. v3: Minor corrections of gauge groups of stable models

References in corpus (34)

• D-Branes And K-Theory
• Open Strings
• D-brane probes, RR tadpole cancellation and K-theory charge
• Intersecting Brane Models of Particle Physics and the Higgs Mechanism
• Supersymmetry breaking, open strings and M-theory
• Towards a Non-Supersymmetric String Phenomenology
• Partial breaking of supersymmetry, open strings and M-theory
• Theory and Phenomenology of Type I strings and M-theory
• Strong/Weak Coupling Duality Relations for Non-Supersymmetric String Theories
• Duality without Supersymmetry: The Case of the SO(16)xSO(16) String
• Effective Action and Soft Supersymmetry Breaking for Intersecting D-brane Models
• Chiral Heterotic Strings with Positive Cosmological Constant
• Super no-scale models in string theory
• Open Descendants of Z_2\times Z_2 Freely-Acting Orbifolds
• On exponential suppression of the cosmological constant in non-SUSY strings at two loops and beyond
• GUT Precursors and Entwined SUSY: The Phenomenology of Stable Non-Supersymmetric Strings
• Thermal/quantum effects and induced superstring cosmologies
• Cosmological Phases of the String Thermal Effective Potential
• Induced superstring cosmologies and moduli stabilization
• Stability, enhanced gauge symmetry and suppressed cosmological constant in 9D heterotic interpolating models
• Scherk-Schwarz Breaking and Intersecting Branes
• Attraction to a radiation-like era in early superstring cosmologies
• Duality of N=2 Heterotic -- Type I Compactifications in Four Dimensions
• Superstring cosmology for N_4 = 1 -> 0 superstring vacua
• Quantum no-scale regimes and moduli dynamics
• N=2 -> 0 super no-scale models and moduli quantum stability
• Stability and vacuum energy in open string models with broken supersymmetry
• A Z_2 x Z_2 orientifold with spontaneously broken supersymmetry
• Lectures on Heterotic-Type I Duality
• Massless D-strings and moduli stabilization in type I cosmology
• Quantum no-scale regimes in string theory
• On the quantum stability of IIB orbifolds and orientifolds with Scherk-Schwarz SUSY breaking
• Heterotic-Type I Dual Pairs, Rigid Branes and Broken Susy
• Some Properties of Type I' String Theory

Cited by in corpus (11)

• Stability, enhanced gauge symmetry and suppressed cosmological constant in 9D heterotic interpolating models
• String Defects, Supersymmetry and the Swampland
• Marginal deformations of heterotic interpolating models and exponential suppression of the cosmological constant
• Geometry of orientifold vacua and supersymmetry breaking
• Super No-Scale Models with Pati-Salam Gauge Group
• Target Space Duality of Non-Supersymmetric String Theory
• Interpolation and Exponentially Suppressed Cosmological Constant in Non-Supersymmetric Heterotic Strings with General ${\mathbb{Z}}_2$ Twists
• Three-Generation Super No-Scale Models in Heterotic Superstrings
• One-loop masses of Neumann-Dirichlet open strings and boundary-changing vertex operators
• Two-point functions of Neumann-Dirichlet open-string sector moduli
• Gauge Symmetry Enhancement by Wilson Lines in Twisted Compactification