A Heterotic QCD Axion

Abstract

We show that a KSVZ axion with a decay constant in the phenomenologically allowed range can be obtained in certain $E_8\times E_8$ heterotic string models. These models have an enhanced symmetry locus in the moduli space, and a non-universal, Kahler moduli dependent Fayet-Iliopoulos term which vanishes at this locus. Close to this locus the Fayet-Iliopoulos term is small and can lead to an axion decay constant significantly lower than the string scale. In this way, the no-go arguments of Svrcek and Witten, which are based on a universal, dilaton-dependent Fayet-Iliopoulos term, can be avoided. The relevant axion originates from phases of bundle moduli which correspond to deformations away from the enhanced symmetry locus. We construct an explicit example, based on a heterotic line bundle standard model, with all the required ingredients.

14 pages; v2: minor corrections, references added

References in corpus (23)

• Heterotic and Type I String Dynamics from Eleven Dimensions
• Eleven-Dimensional Supergravity on a Manifold with Boundary
• Axions In String Theory
• The QCD Axion and Moduli Stabilisation
• On the Four-Dimensional Effective Action of Strongly Coupled Heterotic String Theory
• Field Dependent Gauge Couplings in Locally Supersymmetric Effective Quantum Field Theories
• Heterotic Line Bundle Standard Models
• Loop-Corrected Compactifications of the Heterotic String with Line Bundles
• Two Hundred Heterotic Standard Models on Smooth Calabi-Yau Threefolds
• Non-standard embedding and five-branes in heterotic M-Theory
• A Comprehensive Scan for Heterotic SU(5) GUT models
• On Free Quotients of Complete Intersection Calabi-Yau Manifolds
• New Calabi-Yau Manifolds with Small Hodge Numbers
• Stability Walls in Heterotic Theories
• The Moduli Space of Heterotic Line Bundle Models: a Case Study for the Tetra-Quadric
• On axionic dark matter in Type IIA string theory
• String theoretic QCD axions in the light of PLANCK and BICEP2
• A Heterotic Standard Model with B-L Symmetry and a Stable Proton
• Completing the Web of $Z_3$ - Quotients of Complete Intersection Calabi-Yau Manifolds
• On The Warped Heterotic Axion
• Hypercharge Flux in Heterotic Compactifications
• Non-generic Couplings in Supersymmetric Standard Models
• Heterotic Model Building: 16 Special Manifolds

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• The Quality/Cosmology Tension for a Post-Inflation QCD Axion
• Yukawa Unification in Heterotic String Theory
• Heterotic String Models on Smooth Calabi-Yau Threefolds
• A QCD R-Axion
• Axion decay constants at special points in type II string theory