Unification of Couplings and the Dynamical Breakdown of the Electroweak Symmetry

Abstract

I discuss the properties of the minimal supersymmetric extension of the standard model, in the case in which there is a dynamical breakdown of the electroweak symmetry induced by the formation of condensates of the third generation of quarks and their supersymmetric partners. The top quark and Higgs mass predictions derived within this scheme are essentially equivalent to those ones obtained from the requirement of bottom-tau Yukawa coupling unification in a supersymmetric grand unified scenario, if the compositeness scale is identified with the grand unification scale. I give an explanation of this interesting result, for which the relevance of the infrared quasi fixed point on the top quark Yukawa coupling is emphasized.