While the gauge hierarchy problem is resolved by the warped geometry of a 5D Anti deSitter spacetime, the ”Flavor Puzzle” the unexplained six order of magnitude spread between fermion masses remains a secondary challenge to naturalness. We present a solutionwhere fermions are allowed to propagate in the 5D bulk. We prove that their effective 4Dmasses are a function of their localization relative to the IR brane. This geometric approachnaturally generates the fermion mass hierarchy without requiring fine tuned Yukawa couplings, providing a unified origin for both the electroweak scale and the flavor structure ofthe Standard Model.
Stanley Preschutti (Tue,) studied this question.