We present a new supersymmetric extension of the standard model. The model is constructed in warped space, with a unified bulk symmetry broken by boundary conditions on both the Planck and TeV branes. In the supersymmetric limit, the massless spectrum contains exotic colored particles along with the particle content of the minimal supersymmetric standard model (MSSM). Nevertheless, the model st...

Neutrino masses and mixings are very different from quark masses and mixings. This puzzle is a crucial hint in the search for the mechanism which determines fermion masses in grand unified theories. We study the flavour problem in an SO(10) GUT model in six dimensions compactified on an orbifold. Three sequential families are localized at three branes where SO(10) is broken to its three GUT sub...

A summary of the successes of and obstacles to the gauge technique (a non-perturbative method of solving Dyson-Schwinger equations in gauge theories) is given, as well as an outline of how progress may be achieved in this field. 1 The gauge technique Nature seems inordinately fond of gauge theories. Chromodynamics, elec-troweak theory and gravitation are all based on the gauge principle, featur...

We consider a new class of light vectorlike exotics with fractional electric charge which do not come in complete representations of a grand unified gauge group, and are nevertheless compatible with gauge coupling unification and other predictions from Grand Unified Theories. Such states naturally arise in orbifold constructions of the heterotic string. Some aspects of their phenomenology and t...

Apart from supersymmetric theories, the most interesting possibilities for unified theories beyond the standard model are models with large extra dimensions, that is, the brane-world scenario. The domain walls are the simplest branes on which realistic models can be constructed. However, localization of gauge fields on domain walls has been notoriously difficult in field theories, although scal...

We consider 5-dimensional supersymmetric field theories where supersymmetry is broken by the Scherk-Schwarz mechanism (or, equivalently, by the F -term VEV of the radion). In such models, the radion effective potential is calculable in terms of the 5d gauge coupling, the UV cutoff of the 5d field theory, and the field content. We provide simple, explicit formulae for the leading part of the two...

We construct realistic theories in which the Higgs fields arise from extra dimensional components of higher dimensional gauge fields. In particular, we present a minimal 5D SU(3)C×SU(3)W model and a unified 5D SU(6) model. In both cases the theory is reduced to the minimal supersymmetric standard model below the compactification scale, with the two Higgs doublets arising from the 5D gauge multi...

The grand unification is an attractive idea and offers unification of forces and (partial) unification of quarks and leptons in each family.1) For the gauge bosons and the weak Higgs doublet in the standard model (SM), extra gauge bosons and colored Higgs boson are necessary to form complete multiplets of a unified gauge group, GU . Extra particles and their superpartners cause severe problems ...

We show that an intermediate gauge symmetry breaking scale can be a significant source of electric dipole moments for the electron and neutron in supersymmetric grand unified theories. New phases, similar to that of the CKM matrix, appear which do not arise from the supersymmetry (SUSY) breaking operators. To illustrate, we choose some grand unified SUSY models having an intermediate gauge symm...

A formulation of the effective hybridization model is developed which describes Fermi-liquid Kondo and fractionalized (deconfinement spin-liquid-like) states with account possible magnetic ordering. unified consideration charge fluctuation performed within perturbation theory in gauge field treatment. The corresponding contributions to specific heat resistivity are compared.