GUT Precursors and Entwined SUSY: The Phenomenology of Stable Non-Supersymmetric Strings

Abstract

Recent work has established a method of constructing non-supersymmetric string models that are stable, with near-vanishing one-loop dilaton tadpoles and cosmological constants. This opens up the tantalizing possibility of realizing stable string models whose low-energy limits directly resemble the Standard Model rather than one of its supersymmetric extensions. In this paper we consider the general structure of such strings and find that they share two important phenomenological properties. The first is a so-called "GUT-precursor" structure in which new GUT-like states appear with masses that can be many orders of magnitude lighter than the scale of gauge coupling unification. These states allow a parametrically large compactification volume, even in weakly coupled heterotic strings, and in certain regions of parameter space can give rise to dramatic collider signatures which serve as "smoking guns" for this overall string framework. The second is a residual "entwined-SUSY" (or e-SUSY) structure for the matter multiplets in which different multiplet components carry different horizontal $U(1)$ charges. As a concrete example and existence proof of these features, we present a heterotic string model that contains the fundamental building blocks of the Standard Model such as the Standard-Model gauge group, complete chiral generations, and Higgs fields --- all without supersymmetry. Even though massless gravitinos and gauginos are absent from the spectrum, we confirm that this model has an exponentially suppressed one-loop dilaton tadpole and displays both the GUT-precursor and e-SUSY structures. We also discuss some general phenomenological properties of e-SUSY, such as cancellations in radiative corrections to scalar masses, the possible existence of a corresponding approximate moduli space, and the prevention of rapid proton decay.

27 pages, LaTeX, 1 figure, 2 tables

References in corpus (15)

• Towards a Non-Supersymmetric String Phenomenology
• Chiral Heterotic Strings with Positive Cosmological Constant
• Super no-scale models in string theory
• Universality of Gauge Thresholds in Non-Supersymmetric Heterotic Vacua
• On exponential suppression of the cosmological constant in non-SUSY strings at two loops and beyond
• Classification of Standard-like Heterotic-String Vacua
• N=2 -> 0 super no-scale models and moduli quantum stability
• On interpolations from SUSY to non-SUSY strings and their properties
• Quantum no-scale regimes in string theory
• An Update on Brane Supersymmetry Breaking
• Colorful Twisted Top Partners and Partnerium at the LHC
• Lie algebra lattices and strings on T-folds
• A Solution to the Decompactification Problem in Chiral Heterotic Strings
• A Dynamical Mechanism for Large Volumes with Consistent Couplings
• Supersymmetry in Slow Motion

Cited by in corpus (31)

• de Sitter in non-supersymmetric string theories: no-go theorems and brane-worlds
• Stability, enhanced gauge symmetry and suppressed cosmological constant in 9D heterotic interpolating models
• Quantum no-scale regimes and moduli dynamics
• Stability and vacuum energy in open string models with broken supersymmetry
• Stasis in an Expanding Universe: A Recipe for Stable Mixed-Component Cosmological Eras
• Classification of Non-Supersymmetric Pati-Salam Heterotic String Models
• Towards the Classification of Tachyon-Free Models From Tachyonic Ten-Dimensional Heterotic String Vacua
• Supersymmetry Breaking and Stability in String Vacua: brane dynamics, bubbles and the swampland
• Stable Three Generation Standard--like Model From a Tachyonic Ten Dimensional Heterotic--String Vacuum
• Classification of Left-Right Symmetric Heterotic String Vacua
• On the stability of open-string orbifold models with broken supersymmetry
• Marginal deformations of heterotic interpolating models and exponential suppression of the cosmological constant
• Bubble of nothing decays of unstable theories
• Misaligned Supersymmetry and Open Strings
• Heterotic-Type I Dual Pairs, Rigid Branes and Broken Susy
• String Phenomenology From a Worldsheet Perspective
• The landscape of promising non-supersymmetric string models
• Type $\bar{0}$ Heterotic String Orbifolds
• Non-supersymmetric String Models from Anti-D3-/D7-branes in Strongly Warped Throats
• Super No-Scale Models with Pati-Salam Gauge Group
• Modular invariance, misalignment and finiteness in non-supersymmetric strings
• 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
• Type 0 ${\mathbb{Z}}_2\times {\mathbb{Z}}_2$ Heterotic String Orbifolds and Misaligned Supersymmetry
• Higgs-portal dark matter from non-supersymmetric strings
• One-loop masses of Neumann-Dirichlet open strings and boundary-changing vertex operators
• 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
• Quantum stability in open string theory with broken supersymmetry
• Gauge Symmetry Enhancement by Wilson Lines in Twisted Compactification