Invisible Technicolor
  We propose a scenario of dynamical electroweak symmetry breaking which is applicable to the model with no tree-level potential for the elementary Higgs doublet field. An example of such a model is the gauge-Higgs unification model. The strong coupling "technicolor" dynamics can provide the scale of the electroweak symmetry breaking in the potential of the Higgs doublet field. The negative mass squared and quartic coupling can be generated through the Yukawa couplings among heavy and light "technifermions" and the Higgs doublet field. Since the massless "technifermion" is singlet under the electroweak gauge symmetry, no large corrections to the electroweak observables arise. As a prediction of this scenario, there must be a pseudo-Nambu-Goldstone boson which couple with the Higgs field in a specific way, though it is singlet under the standard model gauge symmetry. 
Naoyuki Haba, Noriaki Kitazawa and Nobuchika Okada