Chiral Heterotic Strings with Positive Cosmological Constant

Abstract

We present explicit examples of semi-realistic heterotic models with spontaneously broken supersymmetry, which dynamically lead to breaking scales much smaller than $M_{\mathrm{Planck}}$ and exponentially small positive values for the cosmological constant. Contrary to field theoretic intuition, we find that the global structure of the effective potential is significantly affected by contributions of massive and non-level matched string states and we investigate the conditions that dynamically ensure a number of desired properties.

46 pages, refs added

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• Type $\bar{0}$ Heterotic String Orbifolds
• Super No-Scale Models with Pati-Salam Gauge Group
• A Dynamical Mechanism for Large Volumes with Consistent Couplings
• Satisfiability Modulo Theories and Chiral Heterotic String Vacua with Positive Cosmological Constant
• Gravitational Threshold Corrections in Non-Supersymmetric Heterotic Strings
• Interpolation and Exponentially Suppressed Cosmological Constant in Non-Supersymmetric Heterotic Strings with General ${\mathbb{Z}}_2$ Twists
• Vacuum Energy in Non-Supersymmetric Quasi-Realistic Heterotic-String Vacua with Fixed Moduli
• Dark Horse, Dark Matter: Revisiting the SO(16)x SO(16)' Nonsupersymmetric Model in the LHC and Dark Energy Era
• Three-Generation Super No-Scale Models in Heterotic Superstrings
• Free Fermionic Constructions of Heterotic Strings
• Spontaneous dark-matter mass generation along cosmological attractors in string theory
• GUT Scale Unification in Heterotic Strings
• Holographic Conformal Anomaly and a-Theorem in 5D Scalar-Tensor Theories from Heterotic Strings
• Classification of Pati--Salam Asymmetric ${\mathbb{Z}}_2\times {\mathbb{Z}}_2$ Heterotic String Orbifolds
• Gauge Symmetry Enhancement by Wilson Lines in Twisted Compactification