Exophobic Quasi-Realistic Heterotic String Vacua

Abstract

We demonstrate the existence of heterotic-string vacua that are free of massless exotic fields. The need to break the non-Abelian GUT symmetries in k=1 heterotic-string models by Wilson lines, while preserving the GUT embedding of the weak-hypercharge and the GUT prediction sin^2θ_w(M(GUT))=3/8, necessarily implies that the models contain states with fractional electric charge. Such states are severely restricted by observations, and must be confined or sufficiently massive and diluted. We construct the first quasi-realistic heterotic-string models in which the exotic states do not appear in the massless spectrum, and only exist, as they must, in the massive spectrum. The SO(10) GUT symmetry is broken to the Pati-Salam subgroup. Our PS heterotic-string models contain adequate Higgs representations to break the GUT and electroweak symmetry, as well as colour Higgs triplets that can be used for the missing partner mechanism. By statistically sampling the space of Pati-Salam vacua we demonstrate the abundance of quasi--realistic three generation models that are completely free of massless exotics, rendering it plausible that obtaining realistic Yukawa couplings may be possible in this space of models.

14 pages. Standard LaTex. 1 figure. 2 tables. Typos corrected

References in corpus (10)

• A Mini-Landscape of Exact MSSM Spectra in Heterotic Orbifolds
• The Heterotic Road to the MSSM with R parity
• Orientifolds, hypercharge embeddings and the Standard Model
• Statistics on the Heterotic Landscape: Gauge Groups and Cosmological Constants of Four-Dimensional Heterotic Strings
• Chiral family classification of fermionic Z2xZ2 heterotic orbifold models
• Spinor-Vector Duality in fermionic Z2XZ2 heterotic orbifold models
• Supersymmetry versus Gauge Symmetry on the Heterotic Landscape
• Spinor-Vector Duality in Heterotic SUSY Vacua
• SU(5) orientifolds, Yukawa couplings, Stringy Instantons and Proton Decay
• Free Fermion Orientifolds

Cited by in corpus (62)

• Heterotic Line Bundle Standard Models
• Two Hundred Heterotic Standard Models on Smooth Calabi-Yau Threefolds
• A Comprehensive Scan for Heterotic SU(5) GUT models
• Classification of Heterotic Pati-Salam Models
• Genetic Algorithms and the Search for Viable String Vacua
• Conformal Aspects of Spinor-Vector Duality
• Non-Tachyonic Semi-Realistic Non-Supersymmetric Heterotic String Vacua
• Top Quark Mass in Exophobic Pati--Salam Heterotic String Model
• Classification of Standard-like Heterotic-String Vacua
• Classification of Flipped SU(5) Heterotic-String Vacua
• The 750 GeV diphoton LHC excess and Extra Z's in Heterotic-String Derived Models
• String Derived Exophobic SU(6)xSU(2) GUTs
• Large volume susy breaking with a solution to the decompactification problem
• Interpolations Among NAHE-based Supersymmetric and Nonsupersymmetric String Vacua
• Superstring cosmology for N_4 = 1 -> 0 superstring vacua
• Classification of Non-Supersymmetric Pati-Salam Heterotic String Models
• Towards the Classification of Tachyon-Free Models From Tachyonic Ten-Dimensional Heterotic String Vacua
• A Light Z' Heterotic-String Derived Model
• Extra $Z^{\prime }$s and $W^{\prime }$s in Heterotic--String Derived Models
• Asymmetric Gepner Models II. Heterotic Weight Lifting
• Asymmetric Gepner Models (Revisited)
• Stable Three Generation Standard--like Model From a Tachyonic Ten Dimensional Heterotic--String Vacuum
• Investigation of Quasi--Realistic Heterotic String Models with Reduced Higgs Spectrum
• Classification of Left-Right Symmetric Heterotic String Vacua
• Light Z' in Heterotic String Standard-like Models
• Top quark mass coupling and classification of weakly-coupled heterotic superstring vacua
• Proton Stability and Light $Z^{\prime }$ Inspired by String Derived Models
• String Phenomenology From a Worldsheet Perspective
• Permutation orbifolds of heterotic Gepner models
• Type $\bar{0}$ Heterotic String Orbifolds
• The Flipped SU(5) String Vacua Classification: A Variation Of The SO(10) Breaking Basis Vector
• The Equivalence Postulate of Quantum Mechanics: Main Theorems
• Super No-Scale Models with Pati-Salam Gauge Group
• Proton Stability, Gauge Coupling Unification and a Light $Z^{\prime }$ in Heterotic-string Models
• Classification of SU(4) X SU(2) X U(1) Heterotic-String Models
• Doublet-Triplet Splitting in Fertile Left-Right Symmetric Heterotic String Vacua
• Asymmetric Gepner Models III. B-L Lifting
• Satisfiability Modulo Theories and Chiral Heterotic String Vacua with Positive Cosmological Constant
• Jumping Spectra and Vanishing Couplings in Heterotic Line Bundle Standard Models
• The LHC di-photon excess and Gauge Coupling Unification in Extra $Z^{\prime }$ Heterotic-String Derived Models
• Type 0 ${\mathbb{Z}}_2\times {\mathbb{Z}}_2$ Heterotic String Orbifolds and Misaligned Supersymmetry
• Note on a NAHE Variation
• GUTs without guts
• Three-Generation Super No-Scale Models in Heterotic Superstrings
• Towards Classification of $\mathcal{N}=1$ and $\mathcal{N}=0$ Flipped $SU(5)$ Asymmetric ${\mathbb{Z}}_2\times {\mathbb{Z}}_2$ Heterotic String Orbifolds
• MSHSM - Minimal Standard Heterotic String Models
• Leptophobic Z' in Heterotic-String Derived Models
• Heterotic String Models on Smooth Calabi-Yau Threefolds
• Niemeier Lattices in the Free Fermionic Heterotic-String Formulation
• Sterile Neutrinos in String Derived Models
• Phenomenological analysis of D-brane Pati-Salam vacua
• Free Fermionic Constructions of Heterotic Strings
• Towards classification of SO(10) heterotic string vacua
• Spontaneous dark-matter mass generation along cosmological attractors in string theory
• Vacuum Varieties, Holomorphic Bundles and Complex Structure Stabilization in Heterotic Theories
• An involuted orbifold MSSM
• On the Equivalence of String Vacua
• Towards machine learning in the classification of Z2xZ2 orbifold compactifications
• Permutation Orbifolds in Conformal Field Theories and String Theory
• The "landscape" of Pati--Salam heterotic superstring vacua
• Classification of Pati--Salam Asymmetric ${\mathbb{Z}}_2\times {\mathbb{Z}}_2$ Heterotic String Orbifolds
• String Phenomenology: Past, Present and Future Perspectives