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Recently, realistic theories of electroweak symmetry breaking have beenconstructed in which the electroweak symmetry is broken by boundary conditionsimposed at a boundary of higher dimensional spacetime. These theories haveequivalent 4D dual descriptions, in which the electroweak symmetry isdynamically broken by non-trivial infrared dynamics of some gauge interaction,whose coupling g and size N satisfy g^2N > 16pi^2. Such theories allow one tocalculate electroweak radiative corrections, including the oblique parametersS, T and U, as long as g^2N/16pi^2 and N are large. We study how the dualitybetween the 4D and 5D theories manifests itself in the computation of variousphysical quantities. In particular, we study a warped 5D theory where theelectroweak symmetry is broken by boundary conditions at the infrared brane. Weshow that S exceeds the experimental bound if the minimal theory is in a weaklycoupled regime. This requires either an extension of the model or departurefrom weak coupling. An interesting scenario is obtained if the gauge couplingsin the 5D theory take the largest possible values -- the value suggested bynaive dimensional analysis. We argue that such a theory can provide apotentially consistent picture for dynamical electroweak symmetry breaking:corrections to the electroweak observables are sufficiently small whilerealistic fermion masses are obtained without conflicting with bounds fromflavor violation. The theory contains only the standard model quarks, leptonsand gauge bosons below \sim 2 TeV, except for a possible light radion. At \sim2 TeV increasingly broad string resonances appear. An analysis of top-quarkphenomenology and flavor violation is also presented, which is applicable toboth the weakly-coupled and strongly-coupled cases.Comment: 42 pages, 11 figures; reference added, minor correction

Holographic theories of electroweak symmetry breaking without a Higgs boson