Stringent Phenomenological Investigation into Heterotic String Optical Unification

Abstract

For the weakly coupled heterotic string (WCHS) there is a well-known factor of twenty conflict between the minimum string coupling unification scale, Lambda_H ~5x10^(17) GeV, and the projected MSSM unification scale, Lambda_U ~ 2.5x10^(16) GeV, assuming an intermediate scale desert (ISD). Renormalization effects of intermediate scale MSSM-charged exotics (ISME) (endemic to quasi-realistic string models) can resolve this issue, pushing the MSSM scale up to the string scale. However, for a generic string model, this implies that the projected Lambda_U unification under ISD is accidental. If the true unification scale is 5.0x10^(17) GeV, is it possible that illusionary unification at 2.5x10^(17) GeV in the ISD scenario is not accidental? If it is not, then under what conditions would the assumption of ISME in a WCHS model imply apparent unification at Lambda_U when ISD is falsely assumed? Geidt's "optical unification" suggests that Lambda_U is not accidental, by offering a mechanism whereby a generic MSSM scale Lambda_U < Lambda_H is guaranteed. A WCHS model was constructed that offers the possibility of optical unification, depending on the availability of anomaly-cancelling flat directions meeting certain requirements. This paper reports on the systematic investigation of the optical unification properties of the set of stringent flat directions of this model. Stringent flat directions can be guaranteed to be F-flat to all finite order (or to at least a given finite order consistent with electroweak scale supersymmetry breaking) and can be viewed as the likely roots of more general flat directions. Analysis of the phenomenology of stringent flat directions gives an indication of the remaining optical unification phenomenology that must be garnered by flat directions developed from them.

standard latex, 18 pages of text

References in corpus (17)

• Flipping SU(5) out of Trouble
• GUT Model Hierarchies from Intersecting Branes
• A Supersymmetric Flipped SU(5) Intersecting Brane World
• Intersecting Branes Flip SU(5)
• Flat Directions in Left-Right Symmetric String Derived Models
• NAHE-based string models with SU(4) X SU(2) X U(1) SO(10) Subgroup
• Phenomenology of Non-Abelian Flat Directions in a Minimal Superstring Standard Model
• A K-theory Anomaly Free Supersymmetric Flipped SU(5) Model from Intersecting Branes
• Deformed Intersecting D6-Brane GUTS I
• Orbifold Breaking of Left-Right Gauge Symmetry
• SU(5) Unified Theories from Intersecting Branes
• On the Possibility of Optical Unification in Heterotic Strings
• Flipped Cryptons and the UHECRs
• Twenty-five Questions for String Theorists
• Optical Unification
• CP violation in realistic String Models with family universal anomalous U(1)
• Observable/Hidden Broken Symmetry for Symmetric Boundary Conditions

Cited by in corpus (7)

• Quasi-realistic heterotic-string models with vanishing one-loop cosmological constant and perturbatively broken supersymmetry?
• Reconciling Grand Unification with Strings by Anisotropic Compactifications
• Initial Systematic Investigations of the Landscape of Low Layer NAHE Extensions
• Systematic Investigations of the Free Fermionic Heterotic String Gauge Group Statistics: Layer 1 Results
• Redundancies in Explicitly Constructed Ten Dimensional Heterotic String Models
• In Search of the (Minimal Supersymmetric) Standard Model String
• Gauge Models in D Dimensions