Yukawa coupling unification in non-supersymmetric SO(10) models with an intermediate scale

Supersymmetric Cold Dark Matter with Yukawa Unification

The cosmological relic density of the lightest supersymmetric particle of the minimal supersymmetric standard model is calculated under the assumption of gauge and Yukawa coupling unification. We employ radiative electroweak breaking with universal boundary conditions from gravitymediated supersymmetry breaking. Coannihilation of the lightest supersymmetric particle, which turns out to be an al...

Gauge Coupling Unification in General Supersymmetric Models

We study the effects of additional fields on the unification of gauge couplings in supersymmetric models. We find that the effects are quite constrained by the requirement of SU(5) gauge invariance. In general, we find that any extension of the MSSM will form complete SU(5) multiplets or spoil gauge coupling unification.

b-τ Yukawa non-unification in supersymmetric SU(5) with an Abelian flavor symmetry

We present a supersymmetric SU(5)×U(1)H model, free from gauge anomalies, where the Abelian factor U(1)H , introduced to account for the hierarchy of fermion masses and mixings, is broken by the same adjoint representations of SU(5) that also break the GUT symmetry. The model predicts approximate, but never exact, b-τ Yukawa unification. The deviations are related to group theoretical coefficie...

Supersymmetric Grand Unified Theories and Yukawa Unification

Implications of Yukawa unification for the Higgs sector in supersymmetric grand-unified models.

The SU(5) unification-scale relation hb = hτ between the b-quark and τ lepton Yukawa couplings severely constrains tan β and the t-quark mass (even more so if ht = hb = hτ holds) in supersymmetric models. We examine the implications of these constraints for the Higgs sector assuming universal soft breaking terms, and emphasize that both of these relations impose unique characteristics in terms ...