Unification without doublet–triplet splitting

SUSY Multi-Step Unification without Doublet-Triplet Splitting

Matter-Higgs unification in string-inspired supersymmetric Grand Unified Theories predicts the existence of colored states in the Higgs multiplets and calls for two extra generations of Higgs-like fields (’unhiggses’). If these states are present near the TeV scale, gauge-coupling unification points to the existence of two distinct scales, 10 GeV where right-handed neutrinos and a Pati-Salam sy...

Unification without Unification

The logarithmic running of the gauge couplings α1, α2 and α3, indicates that they may unify at some scale MGUT ∼ 10 GeV. This is often taken to imply that the standard model gauge group is embedded into some larger simple group in which quarks and leptons are placed in the same multiplet. These models have generic features, such as proton decay, and generic problems, namely the splitting of the...

Splitting Without Backtracking

Supersymmetric Unification Without Proton Decay

We present a supersymmetric grand unification scheme based on the gauge group SU(3)c×SU(3)L×SU(3)R in which the proton and the lightest supersymmetric particle are stable, neutrinos are necessarily massive, and the observed baryon asymmetry originates in the lepton sector. Such models are also consistent with the measured value of sin θW as well as unification of the gauge couplings. ∗Supported...

Higgs-gauge unification without tadpoles

In orbifold gauge theories localized tadpoles can be radiatively generated at the fixed points where U(1) subgroups are conserved. If the Standard Model Higgs fields are identified with internal components of the bulk gauge fields (Higgs-gauge unification) in the presence of these tadpoles the Higgs mass becomes sensitive to the UV cutoff and electroweak symmetry breaking is spoiled. We find th...